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刷刷题刷刷变学霸
举一反三
【单选题】Ants Have Big Impact on Environment as "Ecosystem Engineers" Research by the University of Exeter has revealed that ants(蚂蚁) have a big impact on their local environment as a result of their activity...
A.
Because they build their own nests.
B.
Because they collect food.
C.
Because their activity affects the environment.
D.
Because they are predators.
【单选题】钢筋调直到末端时，操作人员应避开，以防钢筋短头舞动伤人，短于( )m或直径大于( )mm的钢筋调直，应低速加工。(1.0分)
A.
2、9
B.
1、9
C.
1、6
D.
2、6