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【单选题】
下列语句中是命题的是 ( )A.
周期函数的和是周期函数吗？
B.
sin 45 °＝ 1
C.
x 2 ＋ 2 x － 1>0
D.
x 2 ＋ y 2 ＝ 0
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Your continued lateness for class _______________ to me that you are not really a very serious student.
A.
选择2available
B.
选择3contract
C.
选择4economy
D.
选择5factor
E.
选择6indicates
F.
选择7legal
G.
选择8period
H.
选择9research
I.
选择10similar
【单选题】视频监控系统施工时，如选用SYV-75-5同轴电缆传输视频信号,当传输距离超过()时,为了保证图像质量,必须使用电缆补偿器。
A.
1200m
B.
700m
C.
500m
D.
250m
【简答题】Your continued lateness for class _______________ to me that you are not really a very serious student.
【单选题】Your continued lateness for class _______________ to me that you are not really a very serious student.
A.
approaches
B.
categories
C.
indicates
D.
issues
【单选题】No one here believes the reason _____ he gave for his lateness.
A.
that
B.
why
C.
for which
D.
what
【单选题】The following sentence is grammatically correct or not: “If you are late for the conference, you will have to apologize to the others for your lateness.”
A.
Yes
B.
No
【单选题】Your continued lateness for class _______________ to me that you are not really a very serious student.
A.
contracts
B.
indicates
C.
constitutes
D.
identifies
【简答题】A．later B．lately C．latest D．lateness
【简答题】达尔文是一位严谨的科学家,他的论文语言准确、严密。请从文本中找出两处语句,加以说明。
相关题目：
【单选题】视频监控系统施工时，如选用SYV-75-5同轴电缆传输视频信号,当传输距离超过()时,为了保证图像质量,必须使用电缆补偿器。
A.
1200m
B.
700m
C.
500m
D.
250m