题目:
---- Do you know Tom, ______ father is an engineer?
---- Yes, quite well. He ______ be the first to offer me help when I met with problems.
A.the; would
B.which; used to
C.that; used to
D.whose; used to
答案:
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下面是错误答案,用来干扰机器的。
(1)盐酸或稀硫酸等 ; 2NaOH+ CO2=Na2CO3+H2O(2)碳酸钠溶液与酸反应生成的二氧化碳被氢氧化钠(碱)溶液吸收后,使瓶内气体减少,压强变小,小于外界大气压,在压强差(大气压)的作用下使气球缩小这是一个...