【单选题】According to one survey of 12, 000 people, about 30 percent of those making New Year's resolutions say they don't even keep them into February. And only about 1 in 5 actually stays on track for six mo...
A.
the figure is rather depressing and unexpected as well
B.
those who have made their resolution should give up their effort
C.
whoever keep their resolutions should start eating potato chips
D.
long-term resolutions are not important for those facing troubles
【判断题】蛋白质含有碳链骨架,又含有氮素,是多数微生物的碳源和氮源。
【单选题】According to the instructors in this unit, what is the proper length for making an impromptu speech?
【单选题】某地 2006 年肝炎发病人数占当年传染病发病人数的 10.1% ,该指标为
【单选题】某地2006年肝炎发病人数占当年传染病发病人数的10.1%,该指标为
【单选题】关于反平方定律与声强叠加原理的说法有误的是
A.
反平方定律当距离增加一倍时,声强级变化约6dB
B.
反平方定律指R2=2R1,声强级变化约6dB
C.
反平方定律指当点声源在均匀各向同性的媒介传播时产生
【单选题】关于叠加原理错误的说法是:
C.
用叠加原理计算时,不必考虑各荷载作用的先后顺序。
D.
教材中只讲了叠加原理画弯矩图的例子,说明叠加原理只能计算极个别参数;不能计算变形等参数。
【判断题】不完全连锁的形成来自于姊妹染色单体的交换。
【单选题】关于量子力学中的态叠加原理,下列说法错误的是()