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【单选题】
A wave traveling along a string is described by y ( x , t ) = 0.00327sin(72.1 x - 2.72 t ), in which the numerical constant are in SI units. What are the amplitude y m , angular wave number k , and the angular frequency ω of this wave?A.
y m = 0.0327m, k = 72.1rad/m, ω = 2.72rad/s
B.
y m = 0.00327m, k = 72.1rad/m, ω = 2.72rad/s
C.
y m = 0.00327m, k = 7.21rad/m, ω = 2.72rad/s
D.
y m = 0.00327m, k = 72.1rad/m, ω = 27.2rad/s
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A.
出血性皮疹为淤点或淤斑
B.
皮疹分布于全身皮肤及黏膜
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【单选题】流脑皮疹的特点应除外
A.
出血性皮疹,为瘀点或瘀斑
B.
皮疹分布全身皮肤及黏膜
C.
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D.
在恢复期10%患者可出现口唇疱疹
E.
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