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【单选题】
【Ctrl+Z】组合键的作用是（）。A.
复制
B.
粘贴
C.
撤销
D.
合并
手机使用
分享
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反馈参考答案：
举一反三
【简答题】Health and Safety: the importance of considering health and safety issues when planning office space
【简答题】A．having B．seeking C．losing D．regarding
【简答题】[A] Like [B] Except [C] Regarding [D] With
【简答题】an inaccurate forecast regarding the reading habits of children
【简答题】A．regards B．in relation C．with regard D．regarding
【单选题】The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word ()
A.
Mayday
B.
Pan
C.
Safety
D.
Interco
【单选题】如图所示，一轻绳跨过一个定滑轮，两端各系一质量分别为m1和m2的重物，且m1>m2．滑轮质量及轴上摩擦均不计，此时重物的加速度的大小为a．今用一竖直向下的恒力【图片】代替质量为m1的物体，可得质量为m2的重物的加速度为的大小a′，则【图片】
A.
a ′ = a
B.
a ′ > a
C.
a ′ < a
D.
不能确定
【单选题】Food Safety and Foodborne Illnesses Food safety is an increasingly important public health issue. Governments all over the world are intensifying their efforts to improve food safety. These efforts ar...
A.
to
B.
against
C.
with
D.
towards
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