车身板件表面有旧漆层、旧防腐材料等需要清理，最好使用（）清除。
A．钢丝刷打磨
B．砂轮打磨
C．喷砂处理
参考答案：C
．The middle-aged man said he would accept the job, so we have asked him to __________ his acceptance in writing.
A．confirm
B．convey
C．convince
D．consider
下列程序执行后，SI寄存器中的内容是 【3】 。 MOV SI，-1 MOV L，4 SAL，SI，CL AND SI，7FFFH OR SI，8000H 6．NOT SI
