压力容器主要安全附件是什么?
参考答案:
有安全阀,压力表,液面计等。
___ you read the instructions closely, you would know what I ___ referring to now.[ ]
A. Had, was
B. Should, am
C. Had, am
D. If, was
处方应留存3年备查的药品()。
A.非处方药
B.假药
C.劣药
D.一类精神药品
E.二类精神药品