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【单选题】
在80C51的4个并行口中,作为数据总线的是( )。
A.
P0
B.
P1
C.
P2
D.
P3
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参考答案:
举一反三
【简答题】Object: bike Condition: lost Reason: forget to lock it when shopping Solution: pay for it A: I have to say sorry to you. B: What’s up? A: Your ______ is _________. B: That’s OK. A: Just now, I _____...
【单选题】-- I’m in preparationforthe examination and only sleep four hours a day for a fortnight. -- _______. It is not preparation and worse still it will be bad for your health and study.
A.
You needn’t have that
B.
That’s taking it a bit far
C.
I wouldn’t say no
D.
I can’t agree more
【单选题】—What’s your opinion about my suggestion? —Sorry , I ________.Would you please say it again?
A.
hadn’t listened
B.
wouldn’t listen
C.
wasn’t listening
D.
didn’t listen
【单选题】某采样点温度为27℃,大气压力为100kPa,现用溶液吸收法测定S02的小时平均浓度,采样时间lh,采样流量0.50L/min,吸收液定容至50.00mL,取5.00mL用分光光度法测知S02为1.0μg,该采样点大气在标准状态下的S0。小时平均浓度为()mg/m 3 。
A.
1.0
B.
0.20
C.
0.33
D.
0.37
【单选题】测定大气中的氮氧化物时,用装有5mL吸收液的筛板吸收管采样,采样流量为0.3L/min,采样时间为1h。采样后,样品用吸收液稀释2倍,用比色法测定,与标准曲线对照,得稀释液的浓度为4.0μg/mL。当采样点温度为5℃,大气压为100kPa时,气样中氮氧化物的含量是()mg/m 3 。
A.
2.220
B.
2.300
C.
0.222
D.
0.230
【单选题】要延长设备的技术寿命,就必须用( )对设备加以改造。
A.
新技术
B.
新工艺
C.
新材料
D.
新设备
【单选题】I wouldn’t say your stomach was big, and it is just slightly _____.
A.
convex
B.
crabby
C.
crate
D.
crappy
【单选题】根据下面对话,回答题。 Dialogue One Julie: Hi, Mary, I know you&39;re an expert in skincare. Mary: Well, I wouldn’t say that, but I do know something.____ 1____ Julie: I think I have an oily skin and there’re al...
A.
Make sure you don’t rub it dry
B.
Also, don’t rub it hard
C.
How can I get rid of them?
D.
So how can I help you?
【单选题】吸收法测定大气中的SO2,吸收液体积为10ml,采样时间1h,采样时气温为30℃,大气压为100.5KPa,色法测得SO2的浓度为0.2mg/L,求大气中SO2的浓度()
A.
0.15mg/m 3
B.
0.075mg/m 3
C.
0.13mg/m 3
D.
0.30mg/m 3
【单选题】采用重量法测定空气中可吸入颗粒物的浓度。采样时现场气温为18℃,大气压力为 98.2kPa,采样流速为l3L/min,连续采样24h。若采样前滤膜重量为0.3526g,采样后滤膜重量为0.5961g,计算空气中可吸人颗粒物的浓度为( )。
A.
13.00mg/m3
B.
13.51mg/m3
C.
14.30mg/m3
D.
15.50mg/m3
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