杆件变形的基本形式：____、_____、______、_______四种。
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By mentioning the study of IEEE Spectrum, the author intends to______.
A. prove that the danger of using cell-phone on plane does exist
B. advocate that all airlines should provide Wi-Fi service
C. explain how cell-phone may endanger a flight
D. inform. readers of which devices should be allowed to use on plane
公犬膀胱手术常用的腹壁切口部位是()
A. 耻前腹中线
B. 阴茎旁2～3cm与腹中线平行
C. 胳前腹中线
D. 臁部旁2～3cm
E. 脐前中线旁2～3cm
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