唇齿音f的发音部位是什么？ A.
双唇 B.
上唇和下齿 C.
下唇和上齿 D.
舌尖和硬腭

多项选择题案例中的婴儿产品的特点是

多项选择题糙米碾白可以采用 等方法。

单项选择题任意两个概念之间都存在内涵与外延的反变关系。这种反变关系是指内涵越少的概念外延越大，内涵越多的概念外延越小。（ ）

多项选择题王某应否对李某的继承人承担支付赔偿金的责任?为什么?< )。

单项选择题Delta Co. in State D sent an offer by mail to Echo Co. in State E on January 1. On January 10, Echo Co. mailed back a rejection. On January 11, Echo Co. changed its mind and sent an acceptance in the mail. On January 22, the acceptance was received. On January 23 the rejection was received. According to theUnited Nations Convention on Contracts for the International Sale of Goods (CISG), there was A、no contract because the rejection was effective on its dispatch on January 10. B、a contract because the acceptance was effective on its dispatch on January 11. C、a contract because the acceptance was effective on its receipt on January 22. D、no contract because the rejection was effective on its receipt on January 23.