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某建设项目年设计生产能力10万台，单位产品变动成本为单位产品售价的55%，单位产品销售税金及附加为单位产品售价的5%，经分析求得产销量盈亏平衡点为年产销量4.5万台。若企业要盈利，生产能力利用率至少应保持在()以上。
A . 45%
B . 50%
C . 55%
D . 60%
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推荐知识点:
在自我认识中（）具有核心意义，是自我意识发展的重要标志。
予演模拟图
某企业2007年度全年发生下列业务：（1）采用以货换货方式进行商品交易签订合同两份，一份标明价值，自身商品价值50万元，对方商品价值55万元；另一份未标明价值，只列明用自身10吨的商品换对方9吨的商品，经核实自身商品市场单价10000元／吨，对方商品单价为9500元／吨。（2）签订加工承揽合同两份，其中一份合同分别记载由受托方提供原材料，价值30万元，另收取加工费10万元；另一份合同规定由本单位提供原材料，受托方收取加工费20万元，原材料价值50万元。（3）该企业与外单位签订建筑安装工程承包合同一份，总金额为100万元；该企业又将60万元的工程转包给其他企业，签订合同一份。（4）签订借款合同两份，一份借款金额为200万元，后因故未借，另一份为无息借款合同，借款金额为100万元。承包、转包合同应贴花（）元。
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能作水果的保湿剂，糖尿病患者又能服用的单糖（）。
Overcoming Difficulties ① Life is full of difficulties and obstacles, from birth to death. At times, Life seems like a hurdle race. We are sure of encountering hurdles, but almost always we are taken by surprise. It is necessary to accept that life in general is full of difficulties and adversities. This recognition is the first step. When faced with problems, we often feel, "I am the only one having such problems" Or, we tend to exaggerate our problems and regard them as most complex, most painful，and as an extreme case. But if we look around us, we find people in much worse conditions. As St. Augustine said, "I cried for boots, till I saw a man who had no legs." ② When faced with difficulties, we either complain or seek to dodge them. We behave like as ostrich in the desert. It is said that when there is a storm in the desert, the ostrich buries his head in the sand-hoping that the storm will go away if he ignores it-and finally gets buried under a heap of sand and dies. Some of us choose to pretend that the problems do not exist. We fail to realize that confronting and solving the problem-no painful the process-makes us grow. ③ Accept the woes of birth. It has many implied meanings. First, it means "accepting," i.e., being able to say that it is "my" problem and it is up to me to solve it. Many times we find ourselves putting the blame on others-parents, society or the circumstances of life. Nothing happens by chance, but all is the result of our past actions. There are times when what is needed is patience. We seek to come out of an unpleasant situation quickly. We must understand that if the cause had been operating for a long time, the effect also would last long-as even when the gas has been turned off, the burner remains hot for a long time. Similarly, we expect quick results; having put in the effort, we must be willing to wait. Patient acceptance of what is due to us makes us makes us take a step further in our development. ④ Once we have learnt to deal with a difficulty, the next time we encounter it, it ceases to be a difficulty. But, more often than not the cause of the problem is internal, i.e., within us, and often, it calls for a change. Often the difficulty is solved when we are willing to change—our way of thinking, our feelings, our likes and dislikes—and ready to adapt or adjust ourselves to a problematic situation or a person in life. We must realize that realize that change is inevitable, and always be mentally prepared for it. ⑤ Not all life's problems are such that they need to be dealt with all at once. Sometimes it is possible to take a step and wait for a long time. For instance, if the tap is leaking then we need to call a plumber as soon as we can. But having called him and having found that he can come only the following morning, we should wait patiently for the next 24 hours. In this period, people can get very anxious and go on talking about it to others. There are many such problems in life. Sometimes problems do need taking a step and（）
只接受对侧皮质核束纤维的神经核是（）
下列实物：（1）车床，（2）游标卡尺，（3）洗衣机，（4）减速器，属于机器的是（）。