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【单选题】
表面粗糙度代(符)号在图样上应标注在A.
可见轮廓线上
B.
虚线上
C.
中心线上
D.
符号尖端从材料内指向被标注表面
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反馈参考答案：
举一反三
【简答题】已知2H 2 O 2 =2H 2 O+O 2 ↑，可以通过观察反应过程中O 2 的生成速度(即气泡从溶液中释放的速度)来判断H 2 O 2 分解反应的速度。请用所给的实验材料和用具设计实验，使其能同时验证过氧化氢酶具有催化作用和高效性。要求写出实验步骤、预测实验结果、得出结论，并回答问题。 实验材料与用具：适宜浓度的H 2 O 2 溶液，蒸馏水，3.5%FeCl 3 溶液，0.01%过氧化氢酶溶液...
【单选题】听力原文：M: I'd like to examine your eyes and we'll start with the chart. Would you sit here and look at the chart? Can you see any letters? W: Not really. The letters run together. They seem blurred. Q: ...
A.
In a hospital.
B.
At a school.
C.
In an office.
D.
In a post office.
【单选题】—Hello! This is Henry speaking. I'd like to speak to your father. —Sorry, he has _____ Shanghai. [ ]
A.
been in
B.
been to
C.
gone to
D.
come to
【单选题】—Where would you like to go on your summer holiday, Mike? —I'd like to go [ ]
A.
nowhere interesting
B.
interesting anywhere
C.
somewhere interesting
D.
interesting somewhere
【简答题】下列哪项不属于区别良、恶性肿瘤的要点:
【单选题】听力原文：M: Would you like anything else? W: Well, I'd like to see your pie menu. That's the main reason why I like to dine here. Q: Where does the conversation take place? (3)
A.
At a hotel.
B.
At an office.
C.
At home.
D.
At a restaurant.
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