My ship()that port next month.
A.calls at
B.has called at
C.call at
D.will call at
参考答案:D
开关电源的体积是相控电源的1/10,重量也接近1/10。()
当用楔形线夹连接或固定各种线索时,线索的回头长度应为()mm,并用绑线扎紧。
A.100-500
B.200-500
C.300-500
D.400-500