火力发电厂主机设备为汽轮机、()、发电机。
A.卸煤设施
B.锅炉
C.循环水泵
D.空气预热器
参考答案:B
She came into the room while they ______ television. [A]have watched [B]have been watching[C]were watching
若检测弯沉的平均值为35.2(0.01mm),标准偏差为9.7(0.01mm),已知保证率系数为1.645,t分布系数=0.580,则弯沉代表值为()(0.01mm)。
A.19.2
B.51.2
C.29.6
D.40.8