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形态是物质的表现,可以分为( )和( )
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【单选题】艾滋病病毒属于RNA病毒，具有逆转录酶，如果它决定某性状的一段RNA含碱基A为19%、C为26%、G为32%，则通过逆转录过程形成的双链DNA中碱基A占 [ ]
A.
19%
B.
21%
C.
23%
D.
42%
【简答题】Please fill in the blanks according to what you hear. 1) __________ is a big problem. Many places on 2) __________ are not clean. There is 3) __________ on the land and in the water. The air is 4) ___...
【简答题】Make sentences with the folowing words, you can change the forms. why get up early so you do in the morning cook my in the kitchen now mother what he this time last sunday research read supper newspap...
【简答题】根据对话意思和所给首字母，写出完整正确的单词 As everyone knows, (1) e______________ fast walk or slow walk does good to the muscles and lungs of human. So people walk to build up their body, or to lose (2) w_____________. ...
【简答题】单词填空。 1. Hello, my n_____ is Peter. I'm from England. 2. It's good for our health to g_____ up early in the morning. 3. She was b_____ in a beautiful village near the Lijiang River in 1995. 4. If you ...
【简答题】用所给的词组填空 knock at/on celebrate Chrstmas play a trick/joke on take him for a walk dress up trick or treat Children's Day Teachers' Day your favourite festival paint our ...
【简答题】1) __________ is a big problem. Many places on 2) __________ are not clean. There is 3) __________ on the land and in the water. The air is 4) __________, too. People, cars, 5) __________ and many oth...
【简答题】pollution 1(无字幕).mp4 1)__________ is a big problem. Many places on 2) __________ are not clean. There is 3) __________ on the land and in the water. The air is 4) __________, too. People, cars, 5) ___...
【单选题】艾滋病病毒属于RNA病毒，具有逆转录酶.如果它决定某种性状的一段RNA中A=19%、C=26%、G=32%,则通过逆转录过程形成的DNA中含有 [ ]
A.
19%
B.
21%
C.
23%
D.
42%
【单选题】艾滋病病毒属于RNA病毒，具有逆转录酶，如果它的一段RNA含碱基A23%、C19%、G31%，则通过逆转录过程形成的双链DNA中碱基A的比例是 [ ]
A.
23%
B.
25%
C.
31%
D.
50%
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