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【单选题】
当51系列的单片机中,若接有外部存储器,P2口可作为A.
数据输入口
B.
数据输出口
C.
准双向I/O口
D.
输出高八位地址
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举一反三
【单选题】The twins usually leave _____ home _____ school very early. [ ]
A.
to, for
B.
for, to
C.
from, to
D.
/, for
【单选题】The twins usually_____milkandbreadforbreakfast,but Jim_____somecoffeeforit.
A.
have/have
B.
have/has
C.
has/have
D.
/
【多选题】what are the two suggested models for giving a comment as an attention getter for LO?
A.
statistic model
B.
problem claiming model
C.
quotation model
D.
assumption model
【单选题】People have realized that resources are wasted if goods_________.
A.
are not of lasting value
B.
are not sold at a high price
C.
remain unsold for a long time
D.
remained unsold in export markets
【单选题】某建筑公司融资租赁一台施工设备，设备价格为300万元，租期为6年，每年年末支付租金，折现率为6％，附加率为3％。租赁保证金为30万元，租赁保证金在租赁期满时退还：担保费为2万元。租赁保证金和担保费的时间价值忽略不计。则按附加率法计算的年租金为( )万元。
A.
68．0
B.
77．0
C.
79．0
D.
81．6
【判断题】口腔颌面部X线检查不仅包括牙齿、牙周组织及上下颌骨的检查,还包括颅、面、颈部其他组织结构的检查,如头颅、颅底、颞下颌关节、颜面软组织、唾液腺及颈部等
A.
正确
B.
错误
【单选题】We have P.E lessons _____. [ ]
A.
every two days
B.
each two days
C.
every two day
D.
each two day
【单选题】The twins usually milk and bread for breakfast, but Jim only some coffee for it.
A.
have; have
B.
have; has
C.
has; have
D.
has; has
【单选题】The twins usually milk and bread for breakfast, but Jim some coffee for it.
A.
have/ have
B.
have/ has
C.
has/ have
D.
has/has
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