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【简答题】
以下代码片断中,哪个操作可以找到第二个div,
A. document.getElementsByClassName("box"); B. document.getElementById("box2"); C. document.querySelector(".box"); D. document.querySelector("#box2");
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Traditional Chinese doctors believe it's important _____ a balanced diet. [ ]
A.
to eat
B.
eating
C.
eat
D.
ate
【多选题】要形成流体动力润滑，必须满足以下条件（ ）。
A.
两摩擦表面形成楔形空间
B.
两摩擦表面要有一定的相对滑动速度
C.
两摩擦表面的相对运动方向是由大端到小端
D.
必须保证持续不断的供油。
【简答题】已知 a ? b =-12 2 ，| a |=4， a 和 b 的夹角为135°，则| b |=______．
【多选题】形成流体动力润滑的必要条件是（ ）。
A.
两摩擦表面形成楔形空间
B.
充分供应具有一定粘度的润滑油
C.
具有一定的相对滑动速度，且相对运动方向是由大端指向小端
D.
润滑油温度不超过50℃
【简答题】A. equal B. matched C. proportional D. balanced
【多选题】Situation: Jim asked Magid to come into his home. They talked about what they had been doing since Magid left the company. Magid stayed about three hours and then said, "I'd better go now." Jim got up...
A.
Magid thought that Jim should have asked him to stay longer.
B.
Magid thought that he didn't stay long enough.
C.
Magid couldn't understand why Jim thanked him for coming.
【简答题】什么是接受,构成一项有效接收应当具备什么条件?
【单选题】They said goodbye, little knowing that they were never again. [ ]
A.
met
B.
meeting
C.
to meet
D.
to be met
【简答题】什么是接受,构成一项有效接收应当具备什么条件?
【多选题】Situation: Jim asked Magid to come into his home. They talked about what they had been doing since Magid left the company. Magid stayed about three hours and then said, "I'd better go now." Jim got up...
A.
Jim thought that Magid should have stayed longer. Three hours was too short for a visit.
B.
Jim thought that Magid should have apologized for visiting without calling first.
C.
Jim thought that Magid had stayed too long and that he should have said something like,“I'm sorry if I've disturbed."
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