随机接入的前导格式发为几种?()
A、2
B、5
C、3
D、4
参考答案:A
—Anything to drink? What about coffee?
—Er...I think I'll have a cold drink ________ coffee.
A. other than
B. more than
C. less than
D. rather than
对河道清淤工程,适用的挖土机械是()
A、正铲
B、反铲
C、拉铲
D、抓铲