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【单选题】
FX系列PLC中的LDP,表示 指令。
A.
下降沿
B.
上升沿
C.
输入有效
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
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举一反三
【单选题】Viruses usually have two phases to their execution, the infection phase and the(75)phase. The later phase is optional, since stone viruses simply reproduce.
A.
reproduce
B.
proliferation
C.
defend
D.
attack
查看完整题目与答案
【多选题】工业管道试压前的要求包括( )
A.
管道试压前，应全面检查、核对已安装的管子、管件、阀门、紧固件以及支架等的质量，必须符合设计要求及有关技术规范的规定
B.
试压前，待试管道上的安全阀、爆破板及仪表组件等已经拆下或加以隔离，待试管道与无关系统已用盲板或采取其他措施隔开
C.
管道在试压前，试验范围内的管道安装工程和焊缝及其他待检部位尚未涂漆和绝热，管道上的膨胀节已设置了临时约束装置
D.
试验时应安装不少于两块经校验合格的压力表，并应具有铅封
E.
进行液压试验时，若气温低于8℃，则应采取防冻措施
查看完整题目与答案
【简答题】It is proved that influenza viruses come from the viruses in ______.
查看完整题目与答案
【单选题】(2019 地区一模 ) You should exercise more so as to keep ______ and you can work efficientl y.
A.
confident
B.
outgoing
C.
proud
D.
energetic
查看完整题目与答案
【单选题】By the age of two, Heidi could count to 40, draw pictures of people, and read books ________ for seven­year­olds.
A.
meaning
B.
meant
C.
being meant
D.
to mean
查看完整题目与答案
【单选题】淋巴结内的体液免疫应答主要使哪一结构发生变化
A.
A髓质增大
B.
B深层皮质增大
C.
C淋巴小结增多增大
D.
D淋巴索增粗
E.
E淋巴窦增大
查看完整题目与答案
【单选题】'Viruses waiting for a disease' refers to ______.
A.
those viruses carried in the blood of animals
B.
some viruses which are at present harmless to man
C.
the viruses that reproduce in man without making him ill
D.
the still-not-yet-discovered viruses in the jungle
查看完整题目与答案
【单选题】There are ______reasons for people writing viruses.
A.
three
B.
at least three
C.
over two
查看完整题目与答案
【多选题】切割砂轮使用规定包括（）
A.
工作前检查确认砂轮片无裂纹，无偏扭，螺栓紧固，安全装置齐全可靠
B.
切割时物件要卡牢，用力不得过猛，并站在侧面，戴好眼镜及绝缘防护用品。
C.
被切割的物件不准用手摸，工作完毕或维护检修时必须停机、撤电，电器故障找电工处理
D.
有专人管理，使用规程上墙，开关加锁
查看完整题目与答案
【单选题】______ is not a proper procedure for a lashing of the timber deck cargo．
A.
to be efficiently attached to the deck stringer plate or other strengthened points
B.
to pass over the timber deck cargo
C.
to be shackled to eye plates
D.
to be applied not contacting with the timber deck cargo
查看完整题目与答案
相关题目：
【单选题】Viruses usually have two phases to their execution, the infection phase and the(75)phase. The later phase is optional, since stone viruses simply reproduce.
A.
reproduce
B.
proliferation
C.
defend
D.
attack
查看完整题目与答案
【多选题】工业管道试压前的要求包括( )
A.
管道试压前，应全面检查、核对已安装的管子、管件、阀门、紧固件以及支架等的质量，必须符合设计要求及有关技术规范的规定
B.
试压前，待试管道上的安全阀、爆破板及仪表组件等已经拆下或加以隔离，待试管道与无关系统已用盲板或采取其他措施隔开
C.
管道在试压前，试验范围内的管道安装工程和焊缝及其他待检部位尚未涂漆和绝热，管道上的膨胀节已设置了临时约束装置
D.
试验时应安装不少于两块经校验合格的压力表，并应具有铅封
E.
进行液压试验时，若气温低于8℃，则应采取防冻措施
查看完整题目与答案
【简答题】It is proved that influenza viruses come from the viruses in ______.
查看完整题目与答案
【单选题】(2019 地区一模 ) You should exercise more so as to keep ______ and you can work efficientl y.
A.
confident
B.
outgoing
C.
proud
D.
energetic
查看完整题目与答案
【单选题】By the age of two, Heidi could count to 40, draw pictures of people, and read books ________ for seven­year­olds.
A.
meaning
B.
meant
C.
being meant
D.
to mean
查看完整题目与答案
【单选题】淋巴结内的体液免疫应答主要使哪一结构发生变化
A.
A髓质增大
B.
B深层皮质增大
C.
C淋巴小结增多增大
D.
D淋巴索增粗
E.
E淋巴窦增大
查看完整题目与答案
【单选题】'Viruses waiting for a disease' refers to ______.
A.
those viruses carried in the blood of animals
B.
some viruses which are at present harmless to man
C.
the viruses that reproduce in man without making him ill
D.
the still-not-yet-discovered viruses in the jungle
查看完整题目与答案
【单选题】There are ______reasons for people writing viruses.
A.
three
B.
at least three
C.
over two
查看完整题目与答案
【多选题】切割砂轮使用规定包括（）
A.
工作前检查确认砂轮片无裂纹，无偏扭，螺栓紧固，安全装置齐全可靠
B.
切割时物件要卡牢，用力不得过猛，并站在侧面，戴好眼镜及绝缘防护用品。
C.
被切割的物件不准用手摸，工作完毕或维护检修时必须停机、撤电，电器故障找电工处理
D.
有专人管理，使用规程上墙，开关加锁
查看完整题目与答案
【单选题】______ is not a proper procedure for a lashing of the timber deck cargo．
A.
to be efficiently attached to the deck stringer plate or other strengthened points
B.
to pass over the timber deck cargo
C.
to be shackled to eye plates
D.
to be applied not contacting with the timber deck cargo
查看完整题目与答案