问题
选择题
The parents their children food and clothing.
A．provided;with
B．gave;with
C．supplied;for
D．gave;to
答案
答案：A
provide sb.with sth.是“用某物提供给某人”的意思。
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The parents their children food and clothing.
A．provided;with
B．gave;with
C．supplied;for
D．gave;to
答案：A
provide sb.with sth.是“用某物提供给某人”的意思。
2NH3(g)，若开始时只充入2a mol NH3，达到平衡时，混合气体的压强比起始时增大了40%。若开始时充入a mo N2和3a mol H2的混合气体，求：