重大危险源是客观存在的危险物质或能量超过()的设备设施。
A.500卡
B.1000卡
C.一定量
D.临界量
参考答案：D
If you _____ the meeting place in greater detail, I _____ so much time looking for it.
A．described; wouldn’t waste
B．had described; wouldn’t have wasted
C．would have described; had wasted
D．described; wasted
对企业离退休人员，如果因为企业困难，可以采取离退休金一次性结算的办法吗？
