滑动轴承的允许温升是()。
A、55℃
B、60℃
C、75℃
D、65℃
参考答案:D
—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading.
—Don’t worry. You know, sometimes the Internet ________ be very slow.[ ]
A. can
B. may
C. should
D. must
Technological changes are most likely to result in which of the following effects Evolving technology is likely to result in changes in:
A. educational curriculum only.B. educational curriculum and the relative demand for various products.C. the relative demand for various products only.