起重机及起重设备上所用的电缆,应用()。
A.纤维电缆
B.单股软铜线
C.多股软铜线
D.橡胶绝缘电缆
参考答案:D
根据对话,选择正确的图片。
( ) 1. Is this your end table? Yes, it is.
( ) 2. Is this your bed? No, it isn't. It's my curtain.
甲型肝炎潜伏期为()
A.1~2周
B.2~6周
C.6~8周
D.6周至6个月
E.2~26周