BEIJING As China reopens its economy after months of lockdown, Apple Inc’s (AAPL.O) iPhone factories are largely up and running. But with the coronavirus pandemic spreading across the world, the urgent question for the company is how many buyers there will be both for current models and the new slate of phones expected in the fall. A senior official at one of Apple’s major contract assemblers said Apple’s orders for the quarter ending in March are likely to drop 18% compared with previous year.—Agencies