选择题：[多选题,7.6分] The road declines _______ at this point

题目内容：

[多选题,7.6分]
The road declines _______ at this point.

A.dramatic
B.sharp
C.dramatically
D.sharpen

参考答案：

在晶闸管触发电路中，若使控制电压 UC=0，改变　　的大小，可使直流电动机负载电压 Ud=0，使

在晶闸管触发电路中，若使控制电压 UC=0，改变　　的大小，可使直流电动机负载电压 Ud=0，使触发角α=90o。达到调定移相控制范围，实现整流、逆变的控制

[单选题,7.6分] With a cry, Peter raised his axe and struck ________, burying it in t

According to the author, children in colonial North America weremainly valued f

He cannot be tired _______ he has walked only half a mile.　(A)：since(B)：whether(