某二价金属与盐酸反应，生成a克氢气后，它的质量减少了b克，则该金属的原子量为( ) A.ab／2 B.2b／a C.2a／b
—Do you think you could successfully light the flame at the opening ceremony? —_______. This is not the first time for me. A. Take care B. Hurry up
试用一句话说明京剧是怎样形成的（连标点在内不超过30个书写格）。 京剧的前身是安徽的徽剧。清乾隆五十年（1790）起，原在南方演出的三庆、四喜
It is not rare in that people in fifties were going to university for further education． A．90s; the B．the 90s；/ C．90s; their D．the 90s; their
2009年圣诞节，小明的一位亲戚从台湾回大陆省亲，送给他几盒巧克力，盒上标明“出品日期：中华民国九十八年十月，保质期十二个月”。小明认为不
I asked my boss for a month’s holiday and, _________, she agreed. A. what’s more B. that is to say C. believe it or not D. in other words
28．分条列举在航天飞行时航天员面临的挑战。（每点不超过6个字）。 载人航天是高风险的事业，它要求航天员必须具备办事果断、处变不惊的心理素
满足
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