A/An ________ is a device designed to remove particles and pollutant gases.
A) coal washer B) scrubber C) air filter D) boiler E) tall stack
Question 2
The road from Bangkok to Kuala Lumpur passes through the:
A) Mekong Delta
B) Kra Isthmus
C) Khorat Plateau
D) Annamese Cordillera