From the top of Mount Tai, you can get a wonderful of sunrise. A. scenery B. sightseeing C. view D. scene
Look! The black clouds are gathering, which _____ that it will rain soon. A. indicates B. explodes C. claims D. thinks
两列振幅、波长和波速都相同的简谐波a和b分别沿x轴的正方向、负方向传播波速v＝200m/s，在t＝0时刻的部分波形如图所示，那么在x轴上x＝450m的质点P，
南宋吴自牧的《梦梁录》记载“风雨其晦时，惟凭针盘而行，乃火长掌之，毫厘不敢差误，盖一舟人命所系也。”“一舟人命所系也”的物件使欧洲
甲、乙两物质的溶解度曲线如图所示。下列叙述中正确 的是( ) A． t1℃时，甲和乙的饱和溶液的质量分数均是30% B．甲的溶解度大于乙
_______ hamburgers are junk food, many children like them. A. If B. Unless C. Because D. Although
The meeting was _____ at ten o’clock, but the chairman hadn’t turned up by eleven o’clock. A. start B. have started C. be starting D. be started
三河马、三河牛出产于（ ） A．新疆牧区 B．宁夏牧区 C．青海牧区 D．内蒙古牧区
是 （ ）
上是增函数 B．
上是减函数
上是减函数 D．
上是减函数