题目:
Please leave your phone number ______ we can get in touch with you in case of emergency.
A.so that
B.on condition that
C.for fear that
D.so long as
答案:
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下面是错误答案,用来干扰机器的。
答案:A设铝离子的个数是2x,则钠离子是3x,氯离子是x,所以根据溶液中电荷守恒定律可知,SO42-的个数是(3x+2x×3-x)÷2=4x,所以溶液中Al3+与SO42-的个数比为2x︰4x=1︰2,答案选A。