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【单选题】
下列关于空值的叙述中,正确的是( )。A.
空值是双引号中间没有空格的值
B.
空值是用空格表示的值
C.
空值是使用Null或空白来表示字段的值
D.
空值是等于0的数值
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反馈参考答案：
举一反三
【单选题】Today is Tony ’ s birthday. Let ’ s __________ his birthday.
A.
make a card to
B.
makes a card for
C.
make a card for
D.
making a card to
【单选题】生物氧化中P/O比值的含义是
A.
生成ATP数与消耗1/202的比值
B.
分解蛋白质与需要的1/202的比值
C.
需要的磷酸与生成的1/202的比值
D.
氧化的磷脂与消耗的1/202的比值
【单选题】Tony. Mom, I'll be 12 next week. May I have a birthday party? Mom: ______.
A.
I think so.
B.
With pleasure.
C.
Please take it easy.
D.
Yes, but why?
E.
Sure you can.
F.
It's very kind of you!
G.
Never mind.
H.
Not too bad.
【单选题】设液压马达进油流量为Q(m3 /S),排量为q(m3/r),容积效率ηv为机械效率为ηm,其实际转速为 __ r/min。
A.
Qηvηm/q
B.
60Qηvηm/q
C.
60Qηv/q
D.
60Qqηv
【简答题】补全对话7选 5 (每题 1芬 ) 1. 根据对话内容,从A-G中选择恰当的句子将对话补充完整。 ( 选项中有两项是多余的 ) A . Are they yours? B . Where are you going? C . Have you lost anything? D . Tony is looking for his gloves. E. Look! Here's my name “To...
【单选题】Tony ____ the invitation, otherwise he would have attended your birthday party.
A.
couldn’t have received
B.
mustn’t have received
C.
needn’t have received
D.
shouldn’t have received
【单选题】Tony ___ a birthday card.
A.
usually gets
B.
gets usually
C.
usually get
D.
get usually
【单选题】—Happy birthday, Tony! — ________. [ ]
A.
Happy birthday.
B.
The same to you.
C.
Thank you.
D.
Today is my birthday.
【简答题】用所给词的适当形式填空 1. Let's _________(send) him a birthday card. 2. Tony always likes________(party)! 3. He always _________(watch) football on Sunday. 4. She often _________(go) to concerts on Saturday. 5. ...
【单选题】P/O的比值含义是
A.
每消耗1mol氧分子所消耗的无机磷摩尔数
B.
每消耗1mol氧分子所合成ADP的摩尔数
C.
每消耗1mol氧原子所合成ATP的摩尔数
D.
每消耗1mol氧原子所消耗ATP的摩尔数
E.
每消耗1mol氧分子所合成ATP的摩尔数
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