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胸壁无痛软块,按之有波动,首先应考虑()的可能性。

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TRIPS对商标首次注册保护期限为()年。

A. 1
B. 3
C. 5
D. 7

AL2O3一级品中灼碱应小于等于1.0%()。

A. 正确
B. 错误

What does the FORCE option for creating a view do? ()

A. creates a view with constraints
B. creates a view even if the underlying parent table has constraints
C. creates a view in another schema even if you don't have privileges
D. creates a view regardless of whether or not the base tables exist

当APU靠吸油工作时,是从哪个油箱吸油?()

A. 中央油箱
B. 左主油箱
C. 右主油箱
D. 备用油箱

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