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【单选题】
It can be inferred form. the passage that______.A.
the Romans were bored by their numberical system
B.
the Romans invented abaci
C.
the Romans were very rigid
D.
the Romans didn't want to learn Greek mathematics
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举一反三
【简答题】熟石膏的初凝时间为 终凝时间为 。
【单选题】If you need pens, staplers, paper and other office ______, please submit your request to Mr. Gibson.
A.
workers
B.
facilities
C.
attributes
D.
supplies
【单选题】You are supposed to read your article carefully and get it polished _____ you submit it. [ ]
A.
until
B.
when
C.
before
D.
after
【单选题】以平衡位置为坐标原点,把单摆摆球从平衡位置向位移正方向拉开,使摆线与竖直方向成一微小角度θ,然后由静止放手任其振动,从放手时开始计时。若用余弦函数表示其运动方程,则该单摆振动的初相等于π的倍数是
A.
1倍
B.
0.5倍
C.
0倍
D.
无法确定
【多选题】In the second step to pilot your questionnaire,you submit it to your adviser for scrutiny on:
A.
whether there are grammatical and spelling mistakes
B.
whether the questions in the questionnaire address your overarching research question
C.
whether any important aspects of your research questions are left unaddressed
D.
whether there are mistakes in the way individual questions are formulated
E.
whether the language you use is clear and natural to the respondents
【单选题】如图所示为一单摆装置,把小球从平衡位置 拉开一小角度 至 点,然后由静止放手任其摆动,从放手时开始计时,摆动规律用余弦函数表示,下列说法哪一个是正确的(阻力不计) ?
A.
处，动能最小，相位为
B.
处，动能最大，相位为
C.
处，动能为零，相位为
D.
三位置能量相同，初相不同
【简答题】在对散客送站服务中，导游人员与游客之间确认送站时间和地点的工作必须在送站前_____小时进行。
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