A:C + H2O ='=' CO + H2 ; ΔH='=' +131.3KJ·mol—
B:C(s)+ H2O(g) ='=' CO(g) + H2(g) ; ΔH='=' +10.94KJ·mol—
C:C(s)+ H2O(l) ='=' CO(g) + H2(g) ; ΔH='=' +131.3KJ·mol—
D:C(s)+ H2O(g) ='=' CO(g) + H2(g) ; ΔH== +131.3KJ·mol—
由未受精的卵细胞直接发育而来的生物个体是( )
昆虫飞行时翅膀振动能发出声音,如蜜蜂1min振翅26400次,蝴蝶20s振翅120次,蚊子10s振翅6400次.由此可知,蜜蜂翅膀振动的频率是____Hz,音调最高的是____,人耳听不到声音的是____.