主页
学科
搜索
账户
常见问题
当前学科：磁共振成像MRI医师综合练习
题目：
单选
主肺动脉窗层面不包括哪一解剖结构（）
A . A、升主动脉和降主动脉
B . B、降主动脉，气管
C . C、上腔静脉
D . D、奇静脉弓通常也位于此层面
E . E、头臂静脉
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
类传染性单核细胞增多症与EBV相关性传染性单核细胞增多症不同的是前者（）
下列材料中，气割性能最好的是（）。
李白说“仰天大笑出门去，我辈岂是蓬蒿人”，对“蓬蒿人”的理解正确的是（）
儿童厌食的起因往往不是因为某一身体部位出现病变，而是因为情绪压抑或紧张等心理原因，这表明（）。
Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. By "dropout" the author means（）.
某扦样员在监督抽查过程中发现同一被扦种子批中有两种标签：一种标签标注生产年月为2004年8月，另一种标签标注生产年月为2005年8月。请问扦样员应如何完成扦样任务？并简要回答理由。分二个种子批进行扦样。
催化核苷酸之间形成3′，5′磷酸二酯键的是（）。
根据法律规定，必须由实行区域自治的民族的公民担任的有下列哪些选项？（）
铰刀的切削厚度较小，磨损主要发生在后刀面上，所以重磨沿后刀面进行。
私塾的行政管理权属于()。A、个人B、国家C、集体D、地方政府