用钢丝绳起吊设备;两根钢丝绳之间的夹角不应大于()。
A、30°
B、60°
C、90°
D、120°
参考答案:B
The eye tends to see distance as ().In painting, this is sometimes called "the vanishing point".
A.conforming
B.comforting
C.contriving
D.converging
国家对水资源的管理依法实行什么制度?