模拟信号传输的缺点有（）。
A、抗干扰能力差
B、信号太强
C、信号衰减大
D、信号容易失真
参考答案：A, C, D
下列单据中，经审核无误后可以作为编制记账凭证依据的有( )。
A．填制完毕的工资计算单
B．运费发票
C．银行转来的进账单
D．银行转来的对账单
The man in the lead swung his right arm _______ a signal for us to stop. [ ]
A. as if to make
B. even if to make
C. as though making
D. even though making
