Let $f: \mathbb{R} \rightarrow \mathbb{R}$ be a continuous function with the following property: for all $\alpha \in \mathbb{R}_{>0}$, the sequence $(a_n)_{n \in \mathbb{N}}$ defined as $a_n = f(n\alpha)$ satisfies $\lim_{n \to \infty} a_n = 0$. Is it necessarily true that $\lim_{x \to +\infty} f(x) = 0$?
To determine whether $\lim_{x \to +\infty} f(x) = 0$ given that for all $\alpha \in \mathbb{R}_{>0}$, the sequence $(a_n)_{n \in \mathbb{N}}$ defined as $a_n = f(n\alpha)$ satisfies $\lim_{n \to \infty} a_n = 0$, we proceed as follows:

1. **Given Condition**:
   For any $\alpha > 0$, $\lim_{n \to \infty} f(n\alpha) = 0$.

2. **Assume for Contradiction**:
   Suppose $\lim_{x \to +\infty} f(x) \neq 0$. This means there exists an $\epsilon > 0$ such that for all $M > 0$, there exists $x > M$ with $|f(x)| \geq \epsilon$.

3. **Construct a Sequence**:
   Choose $\alpha = 1$. By the given condition, $\lim_{n \to \infty} f(n) = 0$. This implies that for any $\epsilon > 0$, there exists an $N \in \mathbb{N}$ such that for all $n \geq N$, $|f(n)| < \epsilon$.

4. **Contradiction**:
   However, from our assumption, for any $M > 0$, there exists $x > M$ such that $|f(x)| \geq \epsilon$. Let $M = N$. Then there exists $x > N$ such that $|f(x)| \geq \epsilon$. This contradicts the fact that for all $n \geq N$, $|f(n)| < \epsilon$.

5. **Conclusion**:
   Therefore, our assumption that $\lim_{x \to +\infty} f(x) \neq 0$ must be false. Hence, $\lim_{x \to +\infty} f(x) = 0$.

\[
\boxed{\lim_{x \to +\infty} f(x) = 0}
\]