安装旋塞阀、球阀、闸阀时，允许介质从任意一端流入或流出
参考答案：对
—Were you satisfied with his ________ at the party?
—Yes. He ________ like a true gentleman.
A. behave, behaved
B. behavior, behaved
C. behave, behaviored
D behavior,behaviored
应首先做的检查是
A．钡餐检查
B．腹部触诊
C．B超检查
D．钡灌肠检查
E．CT检查
