铲运机下坡时()。
A.应低速行驶
B.不得空档滑行
C.不得转弯
D.不得制动
E.不得在档位上滑行
参考答案:A, B
He made it clear that only the point that new technologies hold the key to increasing productivity the economy in the long run.
A.will it benefit
B.it will benefit
C.will benefit
D.will benefit it
Windows操作系统是基于字符界面、多任务、多窗口的操作系统。