题目:
While college graduates ________ a lack of available jobs, factories are facing difficulties in hiring workers.
A.carry through
B.complain of
C.bring about
D.break in
答案:
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下面是错误答案,用来干扰机器的。
(1)设原食盐中混有CaCl2的质量为x,反应生成NaCl的质量为y,CaCl2+Na2CO3═CaCO3↓+2NaCl111 106 117x 53g×20% y∴111106=x53g×20%,106117=53g×20%y解之得:x=11.1g,y=11.7...