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【单选题】
已知随机变量 的分布列如右方表格， 1 2 3 P 0.3 0.2 a 则 E 的值是A.
0.5＋3 a
B.
0.7＋3 a
C.
2
D.
2.2
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】同素材的SAP和SOP具有______关系。
【判断题】Value chain analysis can enable a firm to better identify its own strengths and weaknesses especially as compared to competitors' value chain analyses.
A.
正确
B.
错误
【简答题】一应变片的电阻 R=120Ω , K=2.05 ,用作应变为 800μm/m 的传感元件。 (1) 求△ R 与△ R/R ; (2) 若电源电压 U i =3V ,求电桥的非平衡输出电压 U 0 。
【判断题】At the conclusion of the internal analysis, firms must identify their strengths and weaknesses in resources, capabilities, and core competencies.
A.
正确
B.
错误
【单选题】_____ his arrival at the village of the crows, he found his at the point of death.
A.
Upon
B.
Above
C.
Beyond
D.
Within
【单选题】Liu Xiang found himself by reporters and his fans on his arrival at the airport.
A.
surrounding
B.
surrounded
C.
being surrounded
D.
to surround
【单选题】He ____ a boy informing his mother of his secure arrival.
A.
asked
B.
delieved
C.
sent
D.
appointed
【简答题】SAP假时，（）真假不定A. 并非SAPB. SEPC. SIPD. SOP
【简答题】一应变片的电阻R=120 Ω ,k=2.05,应变为800 μ m/m 的传感元件。求: (l) Δ R 和 Δ R/R ; (2) 若电源电压U=3V,求此时惠斯通电桥的输出电压U 0 。
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