which of the following molecules is polar?A,BH3B,NF3C,C2H6D,SF6E,CCL4 C,D选项我明白,是空间结构造成没有net pole.其它选项呢?BH3的结构是trigonal planar ,每个键的夹角120度 抵消pole么?其他的呢?写错了，是C，E选

Directions:For this part,you are supposed to write a letter of 100-120 words based on the followi 1.Which is local network range?2km 10km 10km~no limitation2.Customer want to collect a serial signal from far 2km distance which can be a suggestion?RS-485 Zigbee Ethernet Fiber3.How many wires does RJ-45 connector have?8 4 2 164.Which of the followi sat 史上最难最崩溃的题目.关键是我看不懂看题：Barb's motor scooter has a 2-gallon gas tank and can travel m miles on 1 gallon of gas.If gas costs $1.25 per gallon and Barb spends d dollars to fill the tank; which of the followi 英语翻译As usual,allresearchers directly calculate Granger causality based on thetwo estimated Model (1) and Model (2) for two given timeseries and do not check re-estimation problem of realizationsof the estimated Model (2) at all.In the followi the tcl command that was executed to submit your run failed with the followi Which of the following is Which of the following is which of the following意思? 英语翻译A,If the media is a Recovery Image for the Embedded System the following language should be used:“ For backup/recovery of an existing pre-installed image only” B,If the media is an Update or Upgrade for the Embedded System the followi words are like windows___we can look into the pastby which in which through which of which Which is the biggest of the three?Which is the smallest of the three? Which of the following is a hobby?Which is NOT? 关于 The users of financial accounting information 的论文请教这是一篇Literature review.我对论文的问题不是很明白,请高手指教一下.问题如下：Your review should allow you to reach some personal conclusions on the followi Which of the following is TRUE Which of the following statements is true which of the following is NOT true? which of the following is true?中文 Which city is the capital of france