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问题 单项选择题

制作临时装片时，必须让盖玻片的一边先接触水，然后再轻轻地盖上，其主要目的是（）

A.避免盖玻片下面出现气泡

B.防止实验材料移动

C.增强透明度

D.防止水溢出

答案

参考答案：A

选择题

It is obvious that on no account _____ to the teacher that he has done the homework on his own.

A．this is the first time he is lying

B．this is the first time he has lied

C．is this the first time has he lied

D．is this the first time he has lied
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单项选择题

哪种情况见不到胃肠型和蠕动波

A．小肠梗阻

B．幽门梗阻

C．结肠梗阻

D．大量腹水

E．腹壁菲薄或松弛的老年人
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