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【单选题】
下列花卉栽培时要求碱性土的是A.
非洲菊
B.
鸳鸯茉莉
C.
杜鹃
D.
龙船花
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反馈参考答案：
举一反三
【简答题】平面任意力系具有 个独立的平衡方程;平面汇交力系具有 个独立的平衡方程;空间力系具有 个独立的平衡方程。
【单选题】What time does the woman ask the man to come to the office?
A.
At 9:00 on Tuesday.
B.
At 9:00 on Wednesday.
C.
At 10:00 on Wednesday.
【单选题】What does 'the 9:25 train' refer to?
A.
The train will leave the station at 9:25.
B.
The train will arrive at the station at 9:25.
C.
Passengers should board the train at 9:25.
D.
Passengers should get off in Oxford at 9:25.
【简答题】平面任意力系有____个独立的平衡方程,平面汇交力系有____个独立的平衡方程,平面平行力系有____个独立的平衡方程,平面力偶系有____个独立的平衡方程。
【单选题】What is Cas9 and what does it do?
A.
an RNA molecule that binds to target DNA via complementary base pairing
B.
a DNA sequence that binds the Cas9 protein
C.
a viral protein that disrupts bacterial membranes
D.
a protein enzyme that cuts both strands of DNA at sites specified by an RNA guide
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