钢筋焊接接头的基本力学性能试验包括（）。①拉伸试验②冷弯试验③抗剪试验④弯曲试验 A

钴-60治疗子宫癌盆腔照射时中间铅挡厚度最少需要多少个半价层()

A．2HVL 

B．3HVL 

C．5HVL 

D．6HVL 

E．7HVL

胚胎和胎儿发育的场所______，胚胎发育是从______的分裂开始的．

Questions 14-23

·Look at the ten statements for this part.
·You will hear a passage about "the number of genes ". You will listen to it twice.
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·Markyour answers on the Answer Sheet.

The Genomics Institute of Novartis published a report claiming that humans have more than thirty thousand genes.

A．Right

B．Wrong

C．Not Mentioned

全麻病人侧卧位时上下侧比较肺内气血分布正确的是（）

A.下肺血流多、通气少，VA/Q比值失调

B.下肺通气多、血流少，VA/Q比值失调

C.下肺血流多、通气多，VA/Q比值基本不变

D.上肺通气多、血流多，VA/Q比值基本不变

E.上肺血流多、通气少，VA/Q比值失调

股票基金通常被认为是低风险的投资工具。 ( )