切削用量的选择原则,粗加工时,一般以提高生产率为主,但也应考虑经济性和加工成本()
查看答案
You define the following regular expression of currency values: regex tx = new regex("^-?\d+(\.\d{2})?$") You are required to write code that will be used to find whether a string in the variable named Bill matches the regular expression or not. You are also required to use this code as the expression in a conditional statement and need to know which code segment to use. What should you do?()
A. The tx.Matches(Bill)
B. The tx.Equals(Bill)
C. The tx.Match(Bill)
D. The tx.IsMatch(Bill)
锅炉严重缺水时的现象是()
A. 水位表可见部分见不到水位经叫水后能见到水位
B. 水位表可见部分见不到水位经叫水后仍不见水位
C. 水位表内水位激烈波动
改扩建工程中,应在作业地点悬挂“在此工作!”的安全标志牌。
A. 正确
B. 错误
接地线一经拆除,设备即应视为有电,禁止再去接触或进行作业。
A. 正确
B. 错误