题目: COS5020G示波器面板上的“扫描非校准”按钮弹出时,()被校准到面板指示值。A.TIME/DIVB.CH1的VOLTS/DIVC.CH2的VOLTS/DIVD.以上全部 答案: 参考答案:A
题型:选择题 The World Health Organization warned that Asian countries __________ attentive to bird flu since Asia ___________ got rid of the disease completely.A.should keep; hasB.must remain; has notC.ought to stay; has beenD.shall be; has not been 查看答案