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【简答题】
在图示摆动机构中,已知 L AB =60mm , L AC =120mm ,曲柄 AB 以等角速度ω 1 =30rad/s 转动。试用矢量方程图解法求当∠ BAC = 90 °时, 3 的角速度和角加速度。
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【简答题】It is really a happy thing to look back on the days I spent with Jennie. We met in night school. After Jennie and I had completed the required courses, we started teaching in the same school. For a ti...
【多选题】下列有关颗粒剂特点的叙述中,正确的是()
A.
与散剂相比，混合均匀性较差
B.
与散剂相比，吸湿性较小，稳定性较好
C.
运输、携带、贮存方便
D.
根据需要可加入适宜矫味剂
E.
飞散性、附着性比散剂大
【多选题】Jennie
A.
Seeing a friend
B.
Shopping
C.
Playing tennis
D.
Visiting the museum
E.
Seeing a film
F.
Watching TV
【多选题】Jennie has done in the conversation____
A.
Seeing a friend
B.
Shopping
C.
Playing tennis
D.
Visiting the museum
E.
Seeing a movie
F.
Watching TV
【单选题】The man doesn't want to call Jennie because
A.
he and Jennie argued recently.
B.
he heard Jennie did poorly on the last test.
C.
he doesn't want to bother Jennie so late in the evening.
D.
he'd rather study in his own dormitory.
【多选题】Listen and Choose Jennie——————
A.
Seeing a friend
B.
shopping
C.
playing tennis
D.
visiting the museum
E.
seeing a film
F.
watching TV
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