公路单车道宽度由汽车两车轮间宽度加上车轮与路面边缘宽度与()之和。
A.安全距离
B.挡墙宽度
C.汽车摆动宽度
D.两边挡墙宽度
参考答案:C
I really appreciate ________ to drive me home, but I’m afraid I have to finish my work first.
A.you to offer
B.you offer
C.your offering
D.that you are offering
在单相全波整流电路中,如果电流变压器二次侧电压有效值为50V,则每个二极管承受最大反向电压将是()
A.50V
B.502V
C.1002V
D.100V