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【判断题】
安全期避孕法，效果可靠，常作为首选避孕法。()A.
正确
B.
错误
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【单选题】It was not until he arrived at the railway station ______ he realized he had forgotten his ticket.
A.
before
B.
since
C.
when
D.
that
【单选题】Most Korean young people get plastic surgery______.
A.
during the winter vacation
B.
during the summer vacation
C.
after college
D.
before going on the job market
【简答题】什么是汽油的辛烷值，其常用的两种测试方法是什么？
【单选题】It was at that school ______ he realized his dream ______ he was going to be a teacher.
A.
that; which
B.
that; that
C.
where; that
D.
where; which
【单选题】等直杆上端固定，下端受集中力 F 作用，如图所示，杆件自重为 W =4 F 。以下结论错误的是
A.
自由端轴力0
B.
1-1截面上轴力0
C.
固定端截面上轴力为3F
D.
2-2截面上的轴力为2F
【简答题】以无端链条作为牵引构件,这种无端链条绕过若干个链轮,由驱动链轮带动链条运动,货物直接放在链条上或由动的工作构件上进行输送的机械是( )。A. 4
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