A.30
B.40
C.50
D.60
[单选题]臂架根部铰点高度大于( )的起重机,应安装风速仪。A.30mB.40mC.50mD.60m
[单选题]臂架根部铰点高度大于()的起重机,应安装风速仪。A.30mB.40mC.50mD.60m
[单选题]臂架根部铰点高度大于()的起重机,应安装风速仪。A.30mB.40mC.50mD.60m
[单选题]起重臂根部绞点高度大于()米的塔式起重机应安装风速仪,并灵敏可靠。A .30B .50C .40D .60
[单选题]塔式起重机塔顶高度大于()m的塔式起重机顶端和两臂端应装设红色障碍灯。A .20B .24C .30D .35
[单选题]对臂架铰点超过( )的塔机,应配备风速仪。A.10mB.30mC.50mD.60m
[单选题]塔式起重机安装拆卸作业时,塔式起重机最大安装高度处的风速不能大于()。A .6.9m/sB .7.9m/sC .8.9m/sD .9.9m/s
[判断题]塔式起重机按架设方式分为小车变幅式塔式起重机和动臂变幅式塔式起重机。A.对B.错
[单选题]塔式起重机避雷针高度应为()m。A.0~1B.1~2C.3~4D.2~3
[多选题]塔式起重机臂长可以是( )。A.30mB.80mC.150mD.60m