挤压综合征主要是指伤后出现______
A．呼吸困难B．休克C．昏迷D．肾衰竭E．心力衰竭
参考答案：D
— Margaret ________ stay at home all day long in front of the computer.
— That's right. She should go to the fitness center with us. [ ]
A. doesn't have to
B. couldn't
C. oughtn't to
D. may not
稀释后的微沫剂溶液存放时间不宜超过 ___ 天。
A．3
B．7
C．10
D．15
