复苏过程中评估和决策主要基于哪三个体征?
Would he have seen you if you hadn’t _____ to him?
Paragraphs 2 and 3 explain ________.
以下哪一项是原发性呼吸暂停而不是继发性呼吸暂停的特征?
Even if his letter____tomorrow ， it____too late to do anything.
He set up in business____his own and was very successful.
低压验电笔一般适用于交直流电压为（）v 以下。
工业废水的处理过程是将废水中所含有的各种污染物与水分离或加以分解，使其净化的过程。混凝、气浮方法属于（）。
His proposal is _____ to all of us and you do not need to tell us more about it.
Even if his letter（） tomorrow ，it（） too late to do anything.