旋转接头中有内管和外管,筒式干燥设备上采用的旋转接头是()。
A.只有内管转动
B.只有外管转动
C.内、外管都转动
D.内、外管都不转
参考答案:C
— Excuse me, which is the way to the post office?
— Sorry, I don't know. You can ask the policeman over there.
— ______ [ ]
A. How lucky!
B. It's a pity.
C. Thank you all the same.
黄疸出血型钩体病引起死亡的主要原因是()
A.急性肝衰竭
B.急性肾衰竭
C.消化道大出血
D.肺大出血
E.中枢型呼吸衰竭