成人胸外每按压30次的时间为()
A: 15S～18S
B: 18S～20S
C: 18S～23S
A: 15S～18S
B: 18S～20S
C: 18S～23S
C
举一反三
- 下列程序段的执行结果为（） A: S=3 B: S=18 C: S=6 D: S=9
- 下列纬线中，按由南向北排列顺序正确的是（） A: 30°S、15°S、15°N、30°N B: 30°N、15°N、15°S、30°S C: 10°S、20°S、30°S、40°S D: 40°N、30°N、20°N、10°N
- 机械通气患者每次吸痰时间以( )为宜 A: 10 s B: 15 s C: 20 s D: 30 s E: 60 s
- 完形填空 11 morning, everyone. 12 Grace. Look(看)!This is a 13 . It's a nice pen. What 14 is it? 15 yellow and white. And 16 this in English?It's 17 . It's 18 jacket. That's a ruler. 19 ruler is 20 .16．A．how B．what's C．what A: how B: what's C: what
- 完形填空 11 morning, everyone. 12 Grace. Look(看)!This is a 13 . It's a nice pen. What 14 is it? 15 yellow and white. And 16 this in English?It's 17 . It's 18 jacket. That's a ruler. 19 ruler is 20 .19．A．An B．The C．A A: An B: The C: A
内容
- 0
It’s been calculated that by the age of 18
- 1
在E1载波中，每个子信道的数据速率是 (17) ，E1载波的控制开销占 (18) 。 A: 32Kb/s B: 64Kb/s C: 72Kb/s D: 96Kb/s
- 2
若执行下面的程序时从键盘上输入3和4，则输出是（） main() { int a,b,s; scanf("%d %d",&a,&b); s=a; if(a<b)s=b; s=s*s; printf("%d\n",s);} A: 14 B: 16 C: 18 D: 20
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Underground water supplies about（） A: 80% of Australia’s water B: 48% of Australia’s water C: 18% of Australia’s water D: 80% of Australia’s water
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原核生物核糖体含有的3种rRNA是 A: 5S 16S 18S B: 5S 18S 28S C: 5.8S 18S 28S D: 18S 23S 28S E: 5S 16S 23S