气动切割刀在进行玻璃切割时，刀与所切物体呈（）度角，并来回拉动刀片。
参考答案：45
It is good that we have large national parks, _____ wildlife enjoys proper protection. [ ]
A. whose
B. which
C. where
D. what
针对一个身份证最多可以办理（）个亲情快线套餐。
A.1
B.2
C.5
D.不限制
