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【单选题】
具有ADCC作用的细胞是A.
T细胞
B.
B细胞
C.
K细胞
D.
NK细胞
E.
LAK细胞
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反馈参考答案：
举一反三
【简答题】阅读短文，判断正“T”误“F”。 It was half past five in the evening when Sarah came home form work. She walked into the living room and looked ather three children. The children were four, thir and nine yea...
【单选题】“The past isn’t dead and buried. In fact, it isn’t even past.” The sentence means that ________.
A.
there is no past
B.
today is the result of the past
C.
the past lives longer
D.
people always live in the past
【单选题】某龙门刨床工作台采用 V-M 调速系统。已知直流电动机额定功率60kW,额定电压220V,额定电流305A,额定转速1000r/min ,主电路总电阻 R=0.18 Ω ,Ce=0.2V•min/r, 求 当电流连续时,在额定负载下的转速降落 为多少?
A.
274.5r/min
B.
221.3r/min
C.
200.67r/min
D.
208.35r/min
【单选题】某龙门刨床工作台采用 V-M 调速系统。已知直流电动机额定功率60kW,额定电压220V,额定电流305A,额定转速1000r/min ,主电路总电阻 R=0.18 Ω ,Ce=0.2V•min/r, 求 开环系统机械特性连续段在额定转速时的静差率 多少?
A.
18.67%
B.
21.5%
C.
14.56%
D.
10.89%
【简答题】Write the past form of these verbs from the story:
【判断题】The form of the past perfect continuous tense uses “had been” adding verb “ed” forms. (T/F)
A.
正确
B.
错误
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