两面嵌体不常用作固定桥固位体的主要原因是（）
A.固位力差
B.就位困难
C.影响美观
D.难于制作
E.机械强度低
参考答案：A
Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces，such as in a pumproom，provided that the（）.
A.persons in the space wear gas masks
B.persons in the space wear damp cloths over their mouths and nostrils
C.ventilation system is secured and all persons leave the space
D.ventilation system is kept operating
接管期限届满，国务院银行业监督管理机构可以决定延期，但接管期限最长不得超过（）。
A.一年
B.二年
C.三年
D.半年
