当隧道长度大于3km时,为了加快施工进度,最有效的辅助坑道是()
A、横洞
B、竖井
C、平行导坑
D、斜井
参考答案:C
在急性胰腺炎发病过程中,起关键作用的酶是()
A.溶脂酶
B.弹力蛋白酶
C.胰蛋白酶
D.磷脂酶A
E.激肽酶
In the early days of radio, those who reported the news were ________ to speak with standard dialects.
A.hoped
B.expected
C.wished
D.ordered