工件零点可用()指令在编程中确定。
A、G53、G54、G55;
B、G54、G55、G56;
C、G56、G57、G58;
D、G58、G59、G92
参考答案:D
用所给单词的适当形式填空。
1. In 1809, Santa had eight ________ (reindeer).
2. Most animals run on four ________ (foot).
3. —What's your _______? —1.88m. (high)
4. Her grandfather told her not ________ (water) the flowers if it rained.
5. Our class could play soccer for a week without ________ (stop).
通风空调工程对于民用和公用建筑的低速系统来说其主风道风速为( )m/s。
A.<15
B.<10
C.<12
D.10~15