著作权法规定:“本法的实施条例由国务院著作权行政管理部门制定,报国务院批准后施行”,该规范性质是()
A.委任性规范
B.选择性规范
C.非确定性规范
D.授权性规范
参考答案:A
Jeanne said; “My friend, Mathilde, __ very hard during those years.”
A.had worked
B.use to work
C.used to working
D.used to work
循环特征参数r=-1时,零件承受( )。
A.对称循环应力
B.脉动循环应力
C.静应力
D.不对称循环应力