单项选择题
一维条码是由规则排列的()组成的A、条B、空C、字符D、点此题为多项选择题。
单项选择题一维条码是由规则排列的()组成的
激光焊接机水冷系统的冷却水可以是（）。A、自来水B、矿泉水C、蒸馏水D、双氧水
单项选择题激光焊接机水冷系统的冷却水可以是（）。
While my wife and kids were away for the long weekend, ...
单项选择题While my wife and kids were away for the long weekend, I had the house ___________ myself.
