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【单选题】
当共析碳钢过冷奥氏体的转变产物为珠光体型组织，则其等温温度范围内为A.
A1 ～550℃
B.
550 ℃～350℃
C.
低于Ms
D.
350℃～Ms
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【多选题】Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)
A.
Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B.
Half-duplex Ethernet uses a loopback circuit to detect collisions.
C.
A full-duplex Ethernet card allows 20Mbps for data transmission.
D.
Full-duplex Ethernet makes use of two pairs of wires for data.
E.
An Ethernet hub can operate both half and full duplex simultaneously.
【单选题】下列描述，错误的是( )
A.
阈值是指能引起组织细胞兴奋所必需的最小刺激强度
B.
阈值越大，兴奋性越低
C.
阈值越小，兴奋性越低
D.
阈值越小，兴奋性越高
E.
阈刺激、阈上刺激是使细胞产生兴奋的有效刺激
【简答题】哈佛大学的西奥多·莱维特教授强调,在看产品问题上我们不能有“ ”——不能仅从产品的角度来看待,而应该从顾客的问题的角度来认识产品的性质和行业的性质。
【单选题】A writer has to ____ his imagination and experience to produce good works.
A.
draw upon
B.
pick up
C.
break down
D.
make out
【简答题】Now, the 22-year-old art design major at Sichuan Fine Art Institute has 1) _________ his dream. His micro-blog works have more than 2) _________ followers, and soon he will 3) _________ his first book...
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