25℃时，水的离子积是（） A: 1.00×10-14 B: 1.00×10-7 C: 1.00×1014 D: 1.00×107

-6.00/+5.00=（） A: -11.00 B: -1.00 C: +1.00 D: +11.00

欲配制1.00 L 1.00 mol·L-1的NaCl溶液，可将58.5 g NaCl溶于1.00 L水中

As of today, the spot exchange rate is €1.00 = $1.60 and the rates of inflation expected to prevail for the next year in the U.S. is 2% and 3% in the euro zone. What is the one-year forward rate that should prevail? ( ) A: €1.00 = $1.6157 B: €1.6157 = $1.00 C: €1.00 = $1.5845 D: $1.00 × 1.03 = €1.60 × 1.02

Complete the table below for a 4-20 mA signal: Process Level: Current Level: 5% ( )mA 25% ( )mA 50% ( )mA 75% ( )mA 95% ( ) mA

漏电开关额定漏电动作电流是，不动作电流是（） A: 20 mA、10 mA B: 24 mA、12 mA C: 25 mA、10 mA D: 30 mA、15 mA

角膜曲率仪测定的水平径线为8.0mm，垂直径线为7.8mm，则散光为（）。 A: —1.00*180 B: —1.00*90 C: +1.00*90 D: +1.00*180

She hung on to Ma and sobbed. A: said to Ma B: leaned against Ma C: pushed against Ma D: went to Ma

如：-3.00×90/-4.00×180=-3.00/-1.00×180或-4.00/+1.00×90（）

如下图所示的超声速钝体扰流，1、2区马赫数分别为（ ）[img=478x484]180348f21ccc472.png[/img]‍ A: Ma<1 Ma<1 B: Ma>1 Ma>1 C: Ma<1 Ma>1 D: Ma>1 Ma<1