茶叶为什么会陈化?
参考答案:
茶叶在贮存过程中,由于在光和空气的作用下,内含物质发生自动氧化分解、挥发和缩合等反应,使茶叶香味低浊,品质降低,而导致茶叶陈化。
“两控区”治理工程的重点是( )的酸雨区。
A.东南
B.华北
C.陕北
D.西南
E.华中
You are in charge of a power-driven vessel navigating at night.You sight the red sidelight of another vessel on your port bow.The other vessel’s aft masthead light is to the right of her forward masthead light. You should().
A.stop engines
B.hold course and speed
C.alter course to port
D.sound the danger signal