2022-09-24：以下go语言代码输出什么？A：1；B：3；C：13；D：7。package mainimport (

package main

import (
  "fmt"
  "io/ioutil"
  "net/http"
  "runtime"
)

func main() {
  num := 6
  for index := 0; index < num; index++ {
    resp, _ := http.Get("https://www.baidu.com")
    _, _ = ioutil.ReadAll(resp.Body)
  }
  fmt.Printf("此时goroutine个数= %d\n", runtime.NumGoroutine())
}