红外线干燥中使用的红外线波长是（ ）。 A: 3×10-2m B: 3×103m C: 3×10-17m D: 3×10-7m

2017年6月，国际奥委会宣布3×3篮球成为2020东京奥运会正式比赛项目。（ ）

The radiotelephone safety signal is（）. A: securite repeated 3 times B: safety repeated 3 times C: pan pan repeated 3 times D: securite securite repeated 3 time

从S= {∞·0,∞·1,∞·2}中取n个数做排列，若不允许相邻位置的数相同，有多少种排法?( )。 A: 3×2n-1 B: 3×2n+1 C: 3×2n D: 2n

Normally a person urinates A: 8 eight times per day B: 3~5 times per day C: 5~7 times per day D: 2~3 times per day

把 \(1kg\)，\(20^\circ C\) 的水放到温度恒为 \(500^\circ C\) 的炉子上加热，最后水温达到 \(100^\circ C\)。在这个过程中，水和炉子的熵变分别为 [已知水的比热为\(4.18 \times 10^3 J/(kg \cdot {^\circ C)}\)] A: \(1.01 \times 10^3 J/K\)，\(–0.43 \times 10^3 J/K\)。 B: \(1.01 \times 10^3 J/K\)，\(–0.90 \times 10^3 J/K\)。 C: \(0.90 \times 10^3 J/K\)，\(–0.43 \times 10^3 J/K\)。 D: \(0.90 \times 10^3 J/K\)，\(–0.90 \times 10^3 J/K\)。

class Count {public int count;public Count（int c） {count = c;}public Count（）{count = 1;}}public class Test {public static void increment（Count c, int times） {c.count++;times++;}public static void main A: myCount.count=4 times=0 B: myCount.count=4 times=1 C: myCount.count=3 times=1 D: myCount.count=3 times=0

How often were meetings held on the subject of the ICC（） A: the second and third month of each year B: 2 to 3 times every year C: 2 to 3 times a month D: every 2 or 3 years

设 \( A \)是 \( 3 \times 3 \)矩阵， \( B \)是 \( 4 \times 4 \)矩阵，且\( \left| A \right| = 1,\,\left| B \right| = - 2, \) 则\( \left| {\left| B \right|A} \right| = \) ______

class Count { public int count; public Count(int c) { count = c; } public Count() { count = 1; }}public class Test { public static void increment(Count c, int times) { c.count++; times++; } public static void main(String args[]) { Count myCount = new Count(); int times = 0; for (int i = 0; i A: myCount.count=4 times=0 B: myCount.count=3 times=0 C: myCount.count=4 times=1 D: myCount.count=3 times=1