以下不能实现统计各个部门男教师的人数的命令是？ A: db.teachers.aggregate([{$match:{"sex":"男"}},{$group:{"_id":{"dept":"$dept"},"num_count":{$sum:1}}}]) B: db.teachers.aggregate([{$group:{"_id":{"dept":"$dept"},"num_count":{$sum:1}}},{$match:{"sex":"男"}}]) C: db.teachers.group({"key":{"dept":2},"initial":{"count":0},"reduce":function(cur,result){return result.count++},"cond":{"sex":"男"}}) D: db.teachers.runCommand({"group":{"ns":"teachers","key":{"dept":0},"initial":{"count":0},"$reduce": function(cur,result){result.count++;},"cond":{"sex":"男"}}})

Experts say this may be _____________ the warming climate. A: as a result B: in result C: a result of D: a result

阅读下面程序 A: result=""； B: result=null C: result=number1 D: result=number2

count = 0while count < 5： print（ count） count = count + 2print( “Over!")

【单选题】下面 C代码的输出结果是()。int answer,result;answer=100;result=answer-10;printf( “The result is %d” , result+5); A. The result is 90 B. The result is 95 C. The result is 10 D. The result is 100

.Her heart was slightly damaged ______her long illness. A: as a result B: as a result of C: result in D: result from

______, the bad thing has been turned in to a good one. A: As a result B: In result C: As a result of D: Result from

以下代码执行的结果是：（ ）int i=2;int result = 0;switch (i) {case 1:result = result + i;case 2:result = result + i * 2;case 3:result = result + i * 3;}System.out.println(result); A: 0 B: 2 C: 4 D: 10

阅读以下程序public class Count{static int count;int number;public Count(){count = count + 1;number = count;}}class Test{public static void Main(){Count a = new Count();Count b = new Count();Count c = new Count();}}程序运行后，对象a的count值是（） A: 0 B: 1 C: 2 D: 3

下面的方法，当输入为2的时候返回值是多少?（ ） public static int getValue(int i) { int result = 0; switch (i) { case 1: result = result + i; case 2: result = result + i * 2; case 3: result = result + i * 3; } return result; }