鼻窦中以（）容积为最大。
A.额窦
B.上颌窦
C.蝶窦
D.乙状窦
E.筛窦
参考答案：B
The loss has not yet been ______ accurately, but it is believed to be well beyond a hundred million dollars.[ ]
A．calculated
B．considered
C．completed
D．controlled
喷混凝土养护一般在喷完后（）开始。
A.2~4h
B.5~8h
C.10~12h
