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【简答题】
On Beginning of Autumn, people are accustomed to eating watermelons or corns, called _________.
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反馈参考答案：
举一反三
【单选题】But, to the extent that they lock us in to one way of looking at the world, we need to t ranscend them.
A.
keep away from
B.
go beyond
C.
see through
D.
be aware of
【单选题】When we apply the t-test, we need to know that
A.
a t-test statistics can never be negative
B.
a t-test only applies to two-tailed test
C.
the degree of freedom is not that important when the number of observations is large
D.
a t-distribution is not identical to a standard normal distribution when the sample size goes to infinity
【单选题】We need to feel more for what we have instead of complaining what we don't.
A.
regret
B.
grateful
C.
offer
D.
break
【单选题】计算下图所示各机构的自由度,若有复合铰链、局部自由度或虚约束应明确指出,并判断机构的运动是否确定,(图中绘有箭头的构件为原动件)。
A.
有一个局部自由度，一个虚约束， F=3 × 4 － 2 × 4-1=1 因为自由度不等于原动件个数，所以没有确定的相对运动。
B.
有一个局部自由度，一个复合铰链， F=3 × 4 － 2 × 4-1=1 因为自由度不等于原动件个数，所以没有确定的相对运动。
C.
有一个局部自由度，一个虚约束， F=3 × 4 － 2 × 4-2=2 因为自由度等于原动件个数，所以有确定的相对运动。
D.
有一个虚约束， F=3 × 4 － 2 × 4-2=2 因为自由度等于原动件个数，所以有确定的相对运动。
【简答题】There are many things we need to know, but we do not learn them at school. For example, if we want to use our money wisely, we need to shop carefully. We need to know how to compare(比较) the prices of ...
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