因试管苗在大棚内进行栽培，所以无需进行病虫害防治。

单项选择题汇率是两国货币的兑换比率，也是一种货币用另一种货币表示的价格。

多项选择题Types of the Front Desk Staff in Hotels There are three types of employees working around the Front Desk, including Front Desk reservationists, Front Desk cashiers and Front Desk managers. The main function of the reservationists is to complete the reserv