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【单选题】
比较禽类与大家畜的心脏结构，最大差异位于（ ）。A.
主动脉口
B.
肺动脉口
C.
右房室口
D.
左房室口
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反馈参考答案：
举一反三
【多选题】If Q is large than K, which of the following expression are correct?
A.
The direction of reaction is forward.
B.
The direction of reaction is backward.
C.
The reaction favours products.
D.
The reaction favours reactants.
E.
The reaction turns to left.
F.
The reaction turns to right.
G.
The reaction Gibbs energy is large than 0.
【单选题】The country has ______people and ______money ______spent on tobacco every year.
A.
a large quantity of, a number of, are
B.
plenty of, a great deal, are
C.
a great deal of, plenty of, is
D.
a large number of, a large amount of, is
【简答题】大理石钻孔孔径为( ),深度为( )
【判断题】轴箱装置的作用是将轮对和侧架连接在一起；承受和传递轮对与转向架之间的各种载荷，承受车体重力，传递牵引力、制动力；保护轴颈，使轴颈与轴承间得到润滑，减少摩擦以防止在高速运行条件下发生热轴，保证列车运行安全。
A.
正确
B.
错误
【单选题】某校举行 “汉字听写比赛”, 5 个班级代表队的正确答题数如图.这 5 个正确答题数所组成的一组数据的中位数和众数分别是( )
A.
10 ， 15
B.
15 ， 15
C.
13 ， 15
D.
13 ， 20
【判断题】在线性回归模型中,如果误差满足零均值、同方差且互不相关,则回归系数的最佳线性无偏估计(BLUE, Best Linear unbiased estimator)就是普通最小二乘法估计。这里不需要假定误差满足独立同分布(iid)或正态分布,而仅需要满足零均值、不相关及同方差这三个稍弱的条件。
A.
正确
B.
错误
【单选题】Unacceptably large quantities of impurities are left in the oil after the purifying process. which cause is incorrect?
A.
The oil is insuffciently heated.
B.
The throughput is too high
C.
The wrong type of gravity disc is fitted
D.
The density of impurities is too large.
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