A:从南向北逐渐增大
B:从东向西逐渐增大
C:从赤道向两极逐渐增大
D:从两极向赤道逐渐增大
将下列句子改为被动语态(1)I sent a letter to you last month.____(2) Do we use it for cooking?____(3) Where did you build the bridge?____(4) Mother tells me a story every day.____(5) Can he finish his homework on time?____
当低倍镜换为高倍镜后
如图,AB是⊙O的直径,点C,D是圆上两点,∠AOC=100°,则∠D=____ 度.
“古今称国计之富者莫如隋”,这一状况形成的原因主要是( )