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问题 单项选择题

柴油机发生飞车，关闭油门不能熄火时，错误的操作是（）。

A.通过刹车来拖熄火

B.按减压、拆空滤、用衣服堵死进气管断气熄火

C.用衣物堵死排气管闷熄火

D.关闭油箱开关或松开油管接头断油熄火

答案

参考答案：C

填空题

According to historical records，the first (1) Olympic Games can be traced back to 776 BC.They (2) dedicated to the Olympian gods and were staged on the (3) plains of Olympia.They continued for nearly 12 centuries， (4) Emperor Theodosius decreed in 393 A.D.that aU such"pagan cults" (5) banned.
The oldest myth which concerns the beginning of the (6) Games is that of Idaios Daktylos Herakles.According to other (7) ，Zeus，the father of humanity，fought and defeated Cronus in a (8) for the throne of the gods.Finally，the well-known (9) Herakles is mentioned who staged games in Olympia in honour (10) Zeus,because the latter had helped him conquer Elis when (11) went to war against Augeas.
Through the 12 centuries of (12) Olympic Games，many wonderful athletes competed in the stadium and (13) hippodrome of ancient Olympia’s sacred area，moving the crowds with (14) great achievements.Although mortal，their Olympic victories immortalised them.Of (15) best athletes who left their mark on the sacred vallev (16) Olympia，some surpassed all limits and became legends by winning (17) successive Olympic Games and remaining at the forefront of their (18) for more than a decade.
The ancient Olympic Games were (19) a one.day event until 684 BC.when they were extended (20) three days.In the 5th century B.C.，the Games were extended again to cover five days.
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多项选择题

置信度、概率度和精确度关系表现在（）

A、概率度增大，估计的可靠性也增大

B、概率度增大，估计的精确度下降

C、概率度缩小，估计的精确度也缩小

D、概率度缩小，估计的置信度也缩小

E、置信度增大，估计的可靠性也增大
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