自然通风气流下降式烤房通风排湿即打开（）
A.天窗
B.风机
C.炉门
D.进风洞和排湿管
参考答案：D
—Could you tell me _______?
—Certainly. In half an hour. [ ]
A. when will the train arrive
B. when the train will arrive
C. when would the train arrive
D. when the train would arrive
根据《汽车驱动桥修理技术条件》（GB8825—88）技术要求，圆锥主，从动齿轮啮合间隙为（）mm。
A.0.15～0.25
B.0.15～0.35
C.0.15～0.45
D.0.15～0.50
