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【简答题】
什么是变应力的应力比 r ?静应力、脉动循环变应力和对称循环变应力的 r 值各是多少?
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】To prevent a class from being instantiated, _____________________
A.
use the public modifier on the constructor.
B.
use the private modifier on the constructor.
C.
use the static modifier on the constructor.
D.
don't use any modifiers on the constructor.
【单选题】To prevent a class from being instantiated,_______________________
A.
use the static modifier on the constructor.
B.
don't use any modifiers on the constructor.
C.
use the private modifier on the constructor.
D.
use the public modifier on the constructor.
【单选题】The class teacher came up and put a jacket _____ the boy to prevent him from catching a cold .
A.
by
B.
with
C.
off
D.
over
【简答题】旅游业有哪些基本性质?
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