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问题 单项选择题

当预制楼梯吊至离存放架（）处，通过调节葫芦将预制楼梯调整水平，然后吊运至安装施工层。

A.100-200

B.100-300

C.200-300

D.200-400

答案

参考答案：C

填空题
下列方程中：①3x-2=y  ②mn=8  ③x+y=-6  ④
1
x
-4y=0  ⑤3a=2
其中是二元一次方程的是______（只填序号）．
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单项选择题

A client who is planning a pregnancy asks the nurse about ways to promote a healthy pregnancy. Which of the following would be the nurse's best response

A．"Pregnancy is a human process; you don't have to worry. "

B．"You practice good health habits; just follow them and you'll be fine. "

C．"There is nothing you can do to have a healthy pregnaney; it's all up to nature. "

D．"Folic acid, 400 mcg(1mcg= 10μg), improves pregnancy outcomes by preventing certain complications. "
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