起重力矩限位器的作用是防止塔机因超载而导致的整机倾翻事故。
参考答案:对
He spoke slowly so that he could make himself easily. [ ]
A. understand
B. understood
C. understanding
D. to understand
女性,30岁。过去有肺结核病史,近两月咳嗽,无痰,少量间断咯血,乏力,胸片未见活动性肺结核病变,但痰结核菌两次(+)。进一步检查首选().
A.血沉
B.肺部CT
C.结核菌素实验
D.痰脱落细胞检查
E.纤维支气管镜