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【单选题】
桥式起重机的桥架按主梁数量分为( )。
A.
无梁桥架
B.
单梁和 双梁桥架
C.
三梁桥架。
D.
四梁桥架。
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参考答案:
举一反三
【单选题】与mRNA上的5'-GCU-3'密码子对应的tRNA反密码子是( )。(湖南农大2012研)
A.
5'-CGA-3'
B.
5'-ICG-3'
C.
5'-CIG-3'
D.
5'-CGI-3'
【单选题】Welcome Everyone ! I'm always looking for a quicker way to do things on my computer. Since computers and the Internet are constantly changing, there are always new tips to be learned and shared and I ...
A.
Looking for tips for a quicker way to do things.
B.
Trying to offer his own advice for computer problems.
C.
Asking readers to come to ask questions of computer.
D.
Inviting readers to visit the discussion board frequently.
【单选题】采用标准法测定水泥标准稠度用水量时,当标准试杆自水泥净浆表面自由沉入 净浆,30s时距底板 ( ) mm 为标准稠度净浆
A.
4 ± 1
B.
5 ± 1
C.
6±1
D.
10±1
【单选题】Passage 3 Computers can now compete with humans incomplex games such as chess and beat them. This was believed impossible until the end of the last century. Since then, computer memories have become e...
A.
consistent
B.
inconsistent
【单选题】Which of the following has happened since the invention of the Internet and e-mail?
A.
People are talking on the phone more than ever.
B.
Interaction through the computer has replaced a lot of person to person interaction.
C.
Americans are turning into hermits.
D.
Sixty million Americans have bought computers.
【简答题】Ever since computers were used to solve application problems, it was the task of software to bridge the gap between the concepts in an application and computer concepts
【判断题】标准法测定水泥净浆标准稠度用水量时,试杆下沉6 ±1mm时达到标准稠度。
A.
正确
B.
错误
【单选题】用调整水量法测定水泥标准稠度用水量时,以试杆沉入净浆距底板( )时的净浆为标准稠度水泥净浆。
A.
4±1mm
B.
5±1mm
C.
6±1mm
D.
7±1mm
【判断题】比较大豆株高与单株粒数两个性状的标准差,可以获知哪个性状的变异更大。
A.
正确
B.
错误
【单选题】行驶系的功用有()。
A.
承受汽车的总质量和地面的反力
B.
保持行驶的平顺性
C.
保证汽车操纵稳定性
D.
以上三项都正确
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