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【单选题】
如图1-1所示，质量为M的物体悬挂在细绳上，细绳跨过定滑轮，另一端系一质量为m的物体，m在水平地面上的位置1处保持静止，把m移至2处，仍保持静止，则在两个位置上（ ）A.
m所受的绳的拉力改变，地面的摩擦力不变
B.
m所受的绳的拉力不变，地面的摩擦力减小
C.
m所受的绳的拉力改变，地面的摩擦力减小
D.
m所受的绳的拉力不变，地面的支持力不变
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【简答题】台北故宫博物院外观采用中国宫廷式设计，收藏品共 70 万余件，大部分为 1949 年之前从北京故宫博物院运走的文物，其三大镇馆之宝是（ ）。A. 大禹治水玉雕B. 毛公鼎C. 肉形石D. 翠玉白菜E. 田黄石三联印章
【简答题】沉管隧道基础形式有_________、_________。
【简答题】The result can yield all kinds of frozen foods in addition to tasty ______ like foams and jellies.
【单选题】Which one of the following options is a disadvantage of quota sampling?
A.
It is relatively expensive.
B.
Only a small sample can be studied.
C.
It doesn’t yield enough accurate information for many forms of commercial market research.
D.
The method can result in certain biases.
【多选题】Which two of statements are true？（）
A.
It is possible to synchronize static methods.
B.
When a thread has yielded as a result of yield（）， it releases its locks.
C.
When a thread is sleeping as a result of sleep（）， it releases its locks.
D.
The Object.wait（） method can be invoked only from a synchronized context.
E.
The Thread.sleep（） method can be invoked only from a synchronized context.
F.
When the thread scheduler receives a notify（） request， and notifies a thread， that thread immediately releases its lock.
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