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【单选题】
光滑面约束够限制非自由体在————方向的运动;该类型约束力的指向为————;属于————。A.
沿接触面公法线指向接触面方向的运动；沿接触面的公法线，指向受力物体；拉力
B.
沿接触面公法线指向接触面方向的运动；沿接触面的公法线，背离受力物体；压力
C.
沿接触面公法线指向接触面方向的运动；沿接触面的公法线，指向受力物体；压力
D.
沿接触面公法线各个方向的运动；沿接触面的公法线，指向受力物体；压力
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】An acid reacts with a base to produce a salt and water. Hydrogen from the acid combines with ( ) from the base to form water molecules.
【简答题】An acid reacts with a base to produce a ( ) and water. Hydrogen from the acid combines with hydroxide from the base to form water molecules.
【单选题】-I don't feel like going out. Why don't we stay at home and watch TV? - _________ You promised to take me out for a ride. [ ]
A.
Really?
B.
Not at all.
C.
Come on !
D.
No matter.
【单选题】—I don't feel like going out. Why don't we watch TV at home? — ______ You promised to take me out for dinner.
A.
Come on!
B.
Really?
C.
Not at all.
D.
Why not?
【单选题】下列因素中，不会引起甲状腺大部切除术后呼吸困难和窒息的是
A.
手术创伤的应激诱发危象
B.
切口内出血压迫气管
C.
气管软化塌陷
D.
喉头水肿
E.
喉返神经损伤两侧声带麻痹
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