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【多选题】
下列关于数制中基数的叙述,正确的有。A.
基数可以是正数,也可以是负数
B.
基数可以是整数,也可以是小数
C.
二进制的基数是2
D.
基数是某数制所包含的数字符号的个数
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举一反三
【单选题】Why cannot the Inmarsat satellites cover the polar regions?
A.
The shipping in polar regions is infrequent.
B.
It is not necessary for communication in polar regions.
C.
The Cospas-Sarsat system iS used in polar system.
D.
Line of sight communication to Inmarsat satellite cannot be established in polar regions
【简答题】A．苯巴比妥 B．苯妥英钠 C．阿普唑仑 D．卡马西平 E．地西泮 在代谢过程中，具有“饱和药代动力学”特点 A． B． C． D． E．
【单选题】Why is the average cost of childcare in Mississippi much lower than in Massachusetts?
A.
The overall quality of service is not as good.
B.
Payments for caregivers there are not as high.
C.
Living expenses there are comparatively low.
D.
Each teacher is allowed to care for more kids.
【简答题】听以下长听力两遍,回答三个问题
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