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探究不同植被对空气湿度的影响时，要注意排除干扰因素。如测试地附近不能有水田、水流、河流、湖泊等
A . 正确
B . 错误
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气焊就是利用（）作为热源的一种焊接方法。
Write down the numbers of the topic sentences in the following passages.①The bright child is patient. ②He can tolerate uncertainty and failure, and will keep trying until he gets an answer. ③When all his experiments fail, he can even admit to himself and others that for the time being he is not going to get an answer. ④This may annoy him, but he can wait. ⑤Very often, he does not want to be told how to do the problem or solve the puzzle he has struggled with, because he does not want to be cheated out of the chance to figure it out for himself in the future. ⑥Not so the dull child. ⑦He cannot stand uncertainty or failure. ⑧To him, an unanswered question is not a challenge or an opportunity, but a threat. ⑨If he can’t find the answer quickly, it must be given to him, and quickly; and he must have answers for everything.
细菌分解糖的能力不同，主要取决于（）
（）是指将MRP确定的订单完成时间为起点，然后安排各道工序，找出各工序的开工日期，进而得到MRP订单的最晚开工日期。
股票型基金由于大比例投资于股票，一般具有（）的特征。
为了简化正弦交流电路的分析和计算，常假设某一正弦量的初相为零，该正弦量叫做参考正弦量，其相量形式称为______相量。
IPv4的32位地址共40多亿个，IPv6的128位地址是IPv4地址总数的_________倍。
细菌细胞壁特有的成分是（）
下列细菌中，有鞭毛结构的细菌是（）
女性，15岁，秋游后低热乏力、咳嗽，少量黏痰2周。胸片示两下肺网状及按小叶分布的斑片状浸润阴影。血白细胞9.8×109／L。该病例经验性治疗首选药物是（）。