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【单选题】
关于核酸探针的描述下列 不正确 的是
A.
可以是DNA
B.
可以是RNA
C.
必须是单链核酸
D.
可用放射性标记
E.
可用非放射性标记
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参考答案:
举一反三
【单选题】听力原文:W: You must have enjoyed using your new camera off your trip? M: I would have,but after buying a new camera especially for that trip, I left it in the car with my friend who drove me to the airpo...
A.
He lost it at the airport.
B.
He enjoyed using it.
C.
He left it in his friend's car.
D.
The camera was damaged.
【单选题】听力原文:W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying a new camera especially for that trip, I left it in the car with my friend who drove me to the airpo...
A.
The man lost his new camera at the airport.
B.
The man left his new camera in his friend's car.
C.
The man enjoyed using his new camera on his trip.
D.
The woman lost her new camera on her way to the airport.
【单选题】我国不少地区把雾霾天气作为一种危害性天气预警预报,下列关于雾霾的说法错误的是:
A.
“雾”和“霾”往往是相互转化,相伴而生的,所以我们常说雾霾天气
B.
在雾霾天气应尽量避免早晚开窗通风,最好等太阳出来后再开窗通风
C.
“雾”和“霾”虽然都会造成能见度恶化,并危害人体健康,但两者有很大区别
D.
雾霾主要是由二氧化硫、氮氧化物和可吸人颗粒物组成,但是颗粒物才是加重污染的罪魁祸首
【单选题】对探测器性能要求,错误的论述是:()。
A.
对X射线能量具有良好的吸收能力
B.
对较大范围的射线强度具有良好的反应能力及均匀性
C.
工作性能稳定,有良好的再现性
D.
残光少,且恢复常态的时间慢
E.
体积小,灵敏度高,少量射线照射,能获得足够大信息强度
【单选题】在下列Java的基本数据类型中,所占字节数最少的是_________。
A.
char
B.
int
C.
double
D.
float
【简答题】A: Good morning, everybody! My name is Li Ming. I will be your tour guide for your trip in Guilin. B: It seems there are so many beautiful sceneries in Guilin. What are we going to see first? A: Today...
【判断题】固定股利支付率政策的主要缺点,在于公司股利支付与其赢利能力相脱节,当赢利降低时仍要支付较高的股利,容易引进公司资金短缺、财务状况恶化。()
A.
正确
B.
错误
【单选题】我国不少地区把雾霾天气作为一种危害性天气预警预报,下列关于雾霾的说法错误的是:
A.
“雾”和“霾”往往是相互转化,相伴而生的,所以我们常说雾霾天气
B.
在雾霾天气应尽量避免早晚开窗通风,最好等太阳出来后再开窗通风
C.
“雾”和“霾”虽然都会造成能见度恶化,并危害人体健康,但两者有很大区别
D.
雾霾主要是由二氧化硫、氮氧化物和可吸入颗粒物组成,但是颗粒物才是加重污染的罪魁祸首
【单选题】高能X射线的能量范围是:
A.
10-60kV
B.
60-160kV
C.
180-400kV
D.
400kV-1MV
E.
2-50MV
【单选题】在下列Java的基本数据类型中,所占字节数最少的是_________。
A.
char
B.
Boolean
C.
short
D.
float
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