汽车式起重机,需放下支腿,在固定点进行吊装作业。严禁带负荷行驶。
参考答案:对
假绝经疗法适用于下列哪种疾病()
A.子宫肌瘤
B.卵巢颗粒细胞瘤
C.无排卵型功血
D.子宫内膜癌
E.子宫内膜异位症
Should English classes be compulsory at the elementary or primary school level in countries where it is not the native language
A.required
B.necessary
C.selected
D.permanent