横拉杆两端与()连接。
A.转向垂臂
B.转向节臂
C.梯形臂
D.转向节
参考答案：C
水系统的性能验证的初始验证阶段的验证周期分（）。
A.5个周期
B.2个周期
C.4个周期
D.3个周期
The computer system suddenly while he was searching for information on the Internet. [ ]
A. broke down
B. broke out
C. broke up
D. broke in
