采用带式闸的是（）。
A、JD-1.6
B、JD-2
C、JD-30
D、JD-1
参考答案：D
The village is ________ on all sides by green mountains, which is rich in natural resources.[ ]
A. surrounded
B. covered
C. divided
D. depended
低压过电流继电器灵敏度应满足（）
A.I2dmin/Inz≥1.2
B.I2dmin/Inz≥1.5
C.I2dmin/Inz≥4
D.I2dmin/Inz≥4～7
