题目内容
（请给出正确答案）
[主观题]
Some companies have introduced flexible working time with less emphasis on pressure ______
____
A. than more on efficiency
B. and more on efficiency
C. and more efficiency
D. than efficiency
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A．下水管，避雷针
B．墙缝凸体
C．安全绳，缓降器
D．窗台，阳台
