单项选择。
—Where you from? —I from China.[ ]
A. are; is
B. is; are
C. am; is
D. are; am
答案:D
[病]
变压器到达现场后应进行器身检查,当器身或钟罩起吊时,吊索与铅垂线的夹角不宜大于()
A.15°
B.20°
C.25°
D.30°