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【单选题】散射特性跟粒子的直径与电磁波的波长有关,下列哪种情况下散射特性呈现瑞利散射的特性。( )
A.
粒子直径与电磁波波长基本差不多。
B.
粒子直径远小于电磁波波长。
C.
粒子直径比电磁波波长大的多。
【单选题】Questions 52 to 56 are based on the following passage. Talk to any parent of a student who took an adventurous gap year(a year between school and university when some students earn money，travel，etc....
A.
lives up to his/her parents’expectations
B.
spends time being lazy and doing nothing
C.
learns skills by spending parents’money
D.
earns his/her living and gains working experience
【单选题】There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A，B. C and D. You should decide on the best ch...
A.
parcels carried in traveling
B.
a comprehensive set of activities
C.
something presented in a particular way
D.
charity actions
【单选题】根据SulzerRTA型柴油机的配桨特性可知，超转速限制区域是指（），在（）才允许使用，超负荷区域是指允许（）运行区。
A.
103%，新船试航时，1小时
B.
104~108%，新船试航时，12小时内允许超负荷1小时
C.
103%，新船试航时，12小时内允许超负荷1小时
D.
104~108%，试验台试车时，12小时内允许超负荷1小时