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【简答题】
当一列火车以10 m/s的速率向东行驶时,若相对于地面竖直下落的雨滴在列车的窗子上形成的雨迹偏离竖直方向30°,则雨滴相对于地面的速率是____ m/s ; 相对于列车的速率是____ m/s .
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举一反三
【单选题】Look! Serveal __ are watching a group of ___ eating grass on the hill.
A.
Germans…. sheep
B.
Germans…sheeps
C.
German….sheep
D.
German…sheeps
【简答题】核酸一级结构是 ___, 也称 ___ 序列。其连接键是 ______, 多核苷酸链的书写方向是 ___ 。
【单选题】Never_the Germans_such a breakfast.
A.
have; had
B.
has: had
C.
did: had
D.
does: have
【单选题】There are four ___________ and two _________ in the group. A. Japanese , Germans B. Japaneses, Germen, C. Japaneses, Germans
A.
Japanese , Germans
B.
Japaneses, Germen
C.
Japaneses, Germans
【单选题】Some ______ and ______ were talking in the restaurant.
A.
Germans Frenches
B.
Germans Frenchmen
C.
Germans an English
D.
German Englishmen
【单选题】A group of _____ are talking with two _____. [ ]
A.
Frenchmen, Germans
B.
Germans, Frenchmans
C.
Frenchmans, Germen
D.
Germen, Frenchmen
【单选题】They are from . They’re .
A.
Germany; Germans
B.
Germans; Germany
C.
Germans; Germany
D.
Germany; Germen
【简答题】多核苷酸链的两端是____和____,其书写方向是____。
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