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How many lines (minimum) make up a block quote?

Writing： Type Chinese characters and complete sentences Topic: 我的好朋友 Word counts: at least 150 words

The light-gathering power of a telescope varies with the __________ of the diameter of the lens or mirror.

The Cassegrain reflector needs a parabolic concave main mirror and a smaller, convex secondary mirror to reflect light back through a hole in the primary.

Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?

According to Chapter 18, what two things are needed to correctly quote a source? Select all that apply.

According to Chapter 3, what is the usual length for an introductory paragraph? 

How can an owner of a small business reduce risk when segregation of duties is not feasible because the cost exceeds the benefits?

Which system is used by the storefront cashiers to check out the customer’s purchases?

A person’s or group’s state of mind, level of enthusiasm, and amount of involvement with work and with life is their MORALE.