长期检修时和在阀门不严密的情况下，应对被检修的设备加上（）的堵板，堵板的厚度应符合设备的参数。
A.金属
B.石棉
C.带有尾巴
参考答案：C
— Where ______ go this summer ?
— I'd like to go ______ warm. [ ]
A. would you like to; some where
B. will you like to; anywhere
C. would you like to; somewhere
D. will you like to; somewhere
显色性好，发光效率高，功率大，能产生很强白光，有“小太阳”美称的光源是（）。
A．金属卤化物灯
B．氙灯
C．高压钠灯
D．低压钠灯
