网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
The scuppers should be plugged____ .
A.only if fixed containment is not used
B.only if portable containment is not used
C.only if fixed containment drains are open
D.whenever the vessel is being bunkered
参考答案
更多 “ The scuppers should be plugged____ .A.only if fixed containment is not usedB.only if portable containment is not usedC.only if fixed containment drains are openD.whenever the vessel is being bunkered ” 相关考题
考题
I ()have been here, but I()not find the time.A. could; couldB. might; couldC. should; couldD. should; would
考题
________ the vessel have no safety radiotelegraphy certificate at the time of her delivery，she ________ be held to be unseaworthy．A.If／mayB.Will／shallC.Should／wouldD.Would／should
考题
______ it rain tomorrow moring, the loading ______.A.Should / will be postponedB.If / shall be postponedC.Should / would be postponedD.If / has to be postponed
考题
单片机PA2控制共阳极LED时，初始化方法是什么（）A．PORTA|=(1＜＜PA2);DDRA|=(1＜＜PA2);B．DDRA|=(1＜＜PA2);PORTA|=(1＜＜PA2);C．PORTA=~(1＜＜PA2);DDRA|=(1＜＜PA2);D．PORTA|=(1＜＜PA2);DDRA=~(1＜＜PA2);
考题
把PA0管脚方向设置为输入，内部电阻上拉使能的具体方法为（）A．PORTA|=(1＜＜PA0);DDRA=~(1＜＜PA0);B．PORTA=~(1＜＜PA0);DDRA=~(1＜＜PA0);C．PORTA|=(1＜＜PA0);DDRA|=~(1＜＜PA0);D．PORTA|=(1＜＜PA0);DDRA|=(1＜＜PA0);
考题
8、单片机PA2控制共阳极LED时，初始化方法是什么（）A．PORTA|=(1＜＜PA2);DDRA|=(1＜＜PA2);B．DDRA|=(1＜＜PA2);PORTA|=(1＜＜PA2);C．PORTA=~(1＜＜PA2);DDRA|=(1＜＜PA2);D．PORTA|=(1＜＜PA2);DDRA=~(1＜＜PA2);
考题
ATMEGA16的IO口中,端口A引脚0～3输出高电平、引脚4～7输出低电平,则相应的寄存器设置指令为：（）A．DDRA＝0xFF； PORTA＝0x0F；B．DDRA＝0x00； PORTA＝0x0F；C．DDRA＝0xFF； PORTA＝0xF0；D．DDRA＝0x0F； PORTA＝0x0F；
考题
6、假如单片机的PA1管脚外接一个按键，不需要外部上拉电阻，则其寄存器的配置方法可以使用（）进行配置。A．PORTA|=(1＜＜PA1); DDRA=~(1＜＜PA1);B．DDRA=~(1＜＜PA1); PORTA|=(1＜＜PA1);C．DDRA|=(1＜＜PA1); PORTA|=(1＜＜PA1);D．PORTA=~(1＜＜PA1); DDRA|=(1＜＜PA1);
考题
假如单片机的PA1管脚外接一个按键，不需要外部上拉电阻，则其寄存器的配置方法可以使用（）进行配置。A．PORTA|=(1＜＜PA1); DDRA=~(1＜＜PA1);B．DDRA=~(1＜＜PA1); PORTA|=(1＜＜PA1);C．DDRA|=(1＜＜PA1); PORTA|=(1＜＜PA1);D．PORTA=~(1＜＜PA1); DDRA|=(1＜＜PA1);
热门标签
最新试卷