【单选题】万用表可用来测量交、直流( )和电流及电阻等电量。
【判断题】万用表可用来测量交、直流电压和电流及电阻等电量。
【判断题】HPLC采用梯度洗脱装置来使不同极性的流动相液体混合均匀。
【判断题】青霉素是肽聚糖单体五肽尾末端的L-丙氨酰-D-丙氨酸的结构类似物,故可与后者相互竞争转肽酶的活力中心。( )
【单选题】采用建筑物的墙体作为竖向承重和抵抗侧力的结构称为( )。
【单选题】听力原文: Tomaz Humor had spent nearly a week huddled on a shelf of the cliff six thousand meters up Nanga Parbat. He was held in his unsteady and dangerous position by ice screws and ropes. The temperatu...
A.
He fell off the mountain.
B.
He lost his way to his base camp.
C.
He was held by ice screws and ropes on the cliff.
D.
He lost his sleeping bag.