含稀有碱基最多的RNA是
A.tRNAB.mRNAC.rRNAD.SnRNAE.hnRNA
参考答案:A
两跨静定梁,全长承受均布荷载q。
要使梁的正负弯矩峰值相等,则D铰离月支座的距离x为()。
A.x=0.172l
B.x=0.125l
C.x=0.25l
D.x=0.1l
The soft music and light blue walls make the customers spend _________ time eating theirmeals. [ ]
A. little
B. no
C. more
D. less