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【单选题】
硼钢的抗拉强度可以达到多少？A.
1200 MPa～1400 Mpa
B.
1200 MPa～1300 Mpa
C.
1300 MPa～1400 Mpa
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反馈参考答案：
举一反三
【单选题】反馈控制系统主要由()、比较器和控制器构成，利用输入与反馈两信号比较后的偏差作为控制信号来自动地纠正输出量与期望值之间的误差，是一种精确控制系统。
A.
给定环节
B.
补偿环节
C.
放大器
D.
检测环节
【单选题】If you have trouble ______ the poems, the notes on the margins will help you.
A.
to understand
B.
understanding
C.
for understanding
D.
with understanding
【单选题】According to the passage, the Whitehead research has taken a big step in ______.
A.
understanding cancer
B.
curing cancer disease
C.
eliminating cancer
D.
preventing cancer
【单选题】Which of the following statements is true according to this passage?
A.
If everyone understands the common purpose, team objectives can be achieved.
B.
That each member emphasizes theirs strengths and minimizes their weakness enables the building of a team's objectives.
C.
Many leaders know how change their groups into productive teams, but they have not enough time.
D.
Feedbacks are not immediate, however, problems can be solved very quickly.
【单选题】反馈控制系统主要由( )、比较器和控制器构成,利用输入与反馈两信号比较后的偏差作为控制信号来自动的纠正输出量与期望值之间的误差,是一种精确控制系统。
A.
给定环节
B.
补偿环节
C.
检测环节
D.
放大器
【单选题】______ is NOT mentioned as a reward for volunteer activities.
A.
Reference
B.
Greater understanding of others
C.
Great understanding of oneself
D.
Opportunity to work in the community
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