IQ在80分以下时,韦氏智力量表VIQ<PIQ的差异可达()分以上。
A.9
B.10
C.11
D.12
参考答案:C
Thanks to the new inventions, our lives are much ______ than before. [ ]
A. convenient
B. more convenient
C. most convenient
D. the most convenient
流动式吊机例行保养的周期是()。
A、4~6h
B、8~10h
C、12~16h
D、20~24h