引起视疲劳的眼部因素包括().
A.屈光不正矫正不合适
B.隐斜视
C.无晶状体眼未戴镜矫正者
D.集合功能差
E.两眼视网膜成像不等
参考答案:A, B, C, D, E
请根据中英文提示或句意,写出句中所缺单词,使句子通顺。(5分)
小题1:My parents love sports, e_________ walking and jogging.
小题2:There are many __________(秘书) in the big company.
小题3:The rubbish bin is full of _________(rubbish) .Who will clean it up?
小题4:The ________(采访者) often ask a lot of questions about ORBIS.
小题5:It’s the ________(right or proper) way to solve the difficult problem.
如图为一列在均匀介质中传播的简谐横波在t="4" s时刻的波形图,若已知波源在坐标原点O处,波速为2 m/s,P、Q分别是平衡位置为4m和7m处的两质点,则( )
A.该波的波长是8m
B.P点振幅比Q点振幅小
C.再经过4s,质点Q通过的路程是0.4 m
D.若该波与频率为2Hz的简谐横波相遇,可发生干涉现象