在心电图上反映左、右两心室去极化过程的波形是______。
参考答案:QRS波
I have had my bike _______ , and I'm going to have somebody _______ my radio tomorrow.
A.repair; to repair
B.repairing; to be repaired
C.repaired; repair
D.to repair; repairing
下列用语不属于客人进入餐厅时的招呼用语的是()。
A、欢迎光临
B、请您稍候
C、请跟我来
D、对不起,让您久等了