螺杆式压缩机启动方式有手动启动和（）。
A.半自动启动
B.联锁启动
C.自动启动
D.微机启动
参考答案：D
They ______ about eight hundred English words by the end of last term. [ ]
A. have learned
B. had learned
C. will learn
D. are going to learn
建筑工程进行施工质量控制时，相关各专业工种之间，应进行（）验收。
A.相互
B.交接
C.各自
D.移交
